Distance Speed and Time Competitive Exams
100 questions · Mathematics
-
Question 1 of 100
A boat's downstream speed is 24 km/hr and its upstream speed is 16 km/hr. Find the speed of the stream.
ExplanationSpeed of stream = (Downstream - Upstream)/2 = (24-16)/2 = 4 km/hr.
-
Question 2 of 100
To convert a speed from km/hr to m/s, you should multiply by:
Explanation1 km/hr = 1000 m / 3600 s = 5/18 m/s, so multiplying by 5/18 converts km/hr to m/s.
-
Question 3 of 100
Convert a speed of 18 m/s into kilometres per hour.
ExplanationTo convert m/s to km/hr, multiply by 18/5: 18 x 18/5 = 64.80 km/hr.
-
Question 4 of 100
A boat's downstream speed is 20 km/hr and its upstream speed is 10 km/hr. Find the speed of the stream.
ExplanationSpeed of stream = (Downstream - Upstream)/2 = (20-10)/2 = 5 km/hr.
-
Question 5 of 100
A train 160 metres long, running at 72 km/hr, crosses a platform 240 metres long. How long does it take to completely cross the platform?
ExplanationTotal distance to cross platform = train length + platform length = 160+240 = 400 m. Speed = 20 m/s. Time = 400/20.00 = 20 seconds.
-
Question 6 of 100
A train 200 metres long is running at 90 km/hr. How long will it take to cross a stationary pole (or a man standing still)?
ExplanationSpeed in m/s = 90 x 5/18 = 25 m/s. Time to cross a pole = Train length / Speed = 200 / 25.00 = 8 seconds.
-
Question 7 of 100
If a boat's speed in still water is 'b' km/hr and the stream's speed is 's' km/hr, the boat's downstream speed is:
ExplanationMoving downstream (with the current), the stream speed adds to the boat's effective speed, so downstream speed = b + s.
-
Question 8 of 100
A boat's downstream speed is 24 km/hr and its upstream speed is 16 km/hr. Find the speed of the boat in still water.
ExplanationSpeed in still water = (Downstream + Upstream)/2 = (24+16)/2 = 20 km/hr.
-
Question 9 of 100
When a train crosses a platform, the total distance covered by the train is equal to:
ExplanationThe front of the train must travel the platform's length, and then the entire train's length must also clear the platform, so total distance = train length + platform length.
-
Question 10 of 100
Car A leaves a point travelling at 60 km/hr. Two hours later, Car B leaves the same point in the same direction at 90 km/hr. In how many hours after Car B starts will it catch up with Car A?
ExplanationWhen B starts, A is already 60x2=120 km ahead. Relative speed = 90-60 = 30 km/hr. Time to catch up = 120/30 = 4 hours.
-
Question 11 of 100
A cyclist rides for equal amounts of time at 50 km/hr and 70 km/hr. Find his average speed for the whole journey.
ExplanationWhen time (not distance) is equal at each speed, average speed IS the simple arithmetic mean: (S1+S2)/2 = (50+70)/2 = 60 km/hr.
-
Question 12 of 100
A boat's downstream speed is 18 km/hr and its upstream speed is 12 km/hr. Find the speed of the boat in still water.
ExplanationSpeed in still water = (Downstream + Upstream)/2 = (18+12)/2 = 15 km/hr.
-
Question 13 of 100
A cyclist rides for equal amounts of time at 40 km/hr and 60 km/hr. Find his average speed for the whole journey.
ExplanationWhen time (not distance) is equal at each speed, average speed IS the simple arithmetic mean: (S1+S2)/2 = (40+60)/2 = 50 km/hr.
-
Question 14 of 100
A train 120 metres long, running at 54 km/hr, crosses a platform 180 metres long. How long does it take to completely cross the platform?
ExplanationTotal distance to cross platform = train length + platform length = 120+180 = 300 m. Speed = 15 m/s. Time = 300/15.00 = 20 seconds.
-
Question 15 of 100
Two towns are 320 km apart. A car starts from Town X at 36 km/hr and another car starts from Town Y at the same time, travelling towards Town X at 44 km/hr. After how many hours will the two cars meet?
ExplanationWhen moving towards each other, relative speed = sum of speeds = 36+44 = 80 km/hr. Time to meet = Distance / Relative speed = 320/80 = 4 hours.
-
Question 16 of 100
A train moves at a speed of 60 km/hr for 3 hours. What distance does it cover?
ExplanationDistance = Speed x Time = 60 x 3 = 180 km.
-
Question 17 of 100
A cyclist rides for equal amounts of time at 30 km/hr and 50 km/hr. Find his average speed for the whole journey.
ExplanationWhen time (not distance) is equal at each speed, average speed IS the simple arithmetic mean: (S1+S2)/2 = (30+50)/2 = 40 km/hr.
-
Question 18 of 100
In a 200 metres race, A gives B a head start of 20 metres. If A and B run at the same speed, by how much distance would A need to catch up to tie the race?
ExplanationA must make up exactly the head start distance given to B, which is 20 metres, to draw level by the finish (since both run at equal speed thereafter).
-
Question 19 of 100
A man travels a certain distance at 36 km/hr and returns the same distance at 54 km/hr. Find his average speed for the entire journey.
ExplanationFor equal distances at two speeds, average speed = 2 x S1 x S2 / (S1+S2) = 2x36x54/(36+54) = 43.20 km/hr. (Note: this is NOT the simple average.)
-
Question 20 of 100
A train moves at a speed of 45 km/hr for 4 hours. What distance does it cover?
ExplanationDistance = Speed x Time = 45 x 4 = 180 km.
-
Question 21 of 100
Convert a speed of 63 km/hr into metres per second.
ExplanationTo convert km/hr to m/s, multiply by 5/18: 63 x 5/18 = 17.50 m/s.
-
Question 22 of 100
A train 120 metres long is running at 54 km/hr. How long will it take to cross a stationary pole (or a man standing still)?
ExplanationSpeed in m/s = 54 x 5/18 = 15 m/s. Time to cross a pole = Train length / Speed = 120 / 15.00 = 8 seconds.
-
Question 23 of 100
Convert a speed of 25 m/s into kilometres per hour.
ExplanationTo convert m/s to km/hr, multiply by 18/5: 25 x 18/5 = 90 km/hr.
-
Question 24 of 100
A boat's speed in still water is 10 km/hr, and the speed of the stream is 2 km/hr. Find the boat's downstream speed.
ExplanationDownstream speed = Boat speed + Stream speed = 10+2 = 12 km/hr.
-
Question 25 of 100
A man travels a certain distance at 40 km/hr and returns the same distance at 60 km/hr. Find his average speed for the entire journey.
ExplanationFor equal distances at two speeds, average speed = 2 x S1 x S2 / (S1+S2) = 2x40x60/(40+60) = 48 km/hr. (Note: this is NOT the simple average.)
-
Question 26 of 100
Two trains, 150 metres and 150 metres long, are running in opposite directions at 60 km/hr and 72 km/hr respectively. In how much time will they completely cross each other?
ExplanationCombined length = 150+150 = 300 m. Relative speed (opposite directions) = (60+72) x 5/18 = 36.67 m/s. Time = 300/36.67 = 8.18 seconds.
-
Question 27 of 100
In a 250 metres race, A gives B a head start of 25 metres. If A and B run at the same speed, by how much distance would A need to catch up to tie the race?
ExplanationA must make up exactly the head start distance given to B, which is 25 metres, to draw level by the finish (since both run at equal speed thereafter).
-
Question 28 of 100
Two towns are 360 km apart. A car starts from Town X at 50 km/hr and another car starts from Town Y at the same time, travelling towards Town X at 70 km/hr. After how many hours will the two cars meet?
ExplanationWhen moving towards each other, relative speed = sum of speeds = 50+70 = 120 km/hr. Time to meet = Distance / Relative speed = 360/120 = 3 hours.
-
Question 29 of 100
A train 180 metres long is running at 72 km/hr. How long will it take to cross a stationary pole (or a man standing still)?
ExplanationSpeed in m/s = 72 x 5/18 = 20 m/s. Time to cross a pole = Train length / Speed = 180 / 20.00 = 9 seconds.
-
Question 30 of 100
How much time will a vehicle take to cover 180 km at a speed of 45 km/hr?
ExplanationTime = Distance / Speed = 180 / 45 = 4 hours.
-
Question 31 of 100
A train 140 metres long is running at 63 km/hr. How long will it take to cross a stationary pole (or a man standing still)?
ExplanationSpeed in m/s = 63 x 5/18 = 17.50 m/s. Time to cross a pole = Train length / Speed = 140 / 17.50 = 8 seconds.
-
Question 32 of 100
A cyclist rides for equal amounts of time at 20 km/hr and 40 km/hr. Find his average speed for the whole journey.
ExplanationWhen time (not distance) is equal at each speed, average speed IS the simple arithmetic mean: (S1+S2)/2 = (20+40)/2 = 30 km/hr.
-
Question 33 of 100
A boat's downstream speed is 18 km/hr and its upstream speed is 12 km/hr. Find the speed of the stream.
ExplanationSpeed of stream = (Downstream - Upstream)/2 = (18-12)/2 = 3 km/hr.
-
Question 34 of 100
Convert a speed of 20 m/s into kilometres per hour.
ExplanationTo convert m/s to km/hr, multiply by 18/5: 20 x 18/5 = 72 km/hr.
-
Question 35 of 100
How much time will a vehicle take to cover 300 km at a speed of 75 km/hr?
ExplanationTime = Distance / Speed = 300 / 75 = 4 hours.
-
Question 36 of 100
A train 100 metres long is running at 45 km/hr. How long will it take to cross a stationary pole (or a man standing still)?
ExplanationSpeed in m/s = 45 x 5/18 = 12.50 m/s. Time to cross a pole = Train length / Speed = 100 / 12.50 = 8 seconds.
-
Question 37 of 100
Convert a speed of 10 m/s into kilometres per hour.
ExplanationTo convert m/s to km/hr, multiply by 18/5: 10 x 18/5 = 36 km/hr.
-
Question 38 of 100
A man travels a certain distance at 50 km/hr and returns the same distance at 70 km/hr. Find his average speed for the entire journey.
ExplanationFor equal distances at two speeds, average speed = 2 x S1 x S2 / (S1+S2) = 2x50x70/(50+70) = 58.33 km/hr. (Note: this is NOT the simple average.)
-
Question 39 of 100
A boat's downstream speed is 22 km/hr and its upstream speed is 14 km/hr. Find the speed of the stream.
ExplanationSpeed of stream = (Downstream - Upstream)/2 = (22-14)/2 = 4 km/hr.
-
Question 40 of 100
The basic relationship between speed, distance, and time is expressed as:
-
Question 41 of 100
In a 120 metres race, A gives B a head start of 12 metres. If A and B run at the same speed, by how much distance would A need to catch up to tie the race?
ExplanationA must make up exactly the head start distance given to B, which is 12 metres, to draw level by the finish (since both run at equal speed thereafter).
-
Question 42 of 100
Convert a speed of 45 km/hr into metres per second.
ExplanationTo convert km/hr to m/s, multiply by 5/18: 45 x 5/18 = 12.50 m/s.
-
Question 43 of 100
Two trains, 100 metres and 140 metres long, are running in opposite directions at 50 km/hr and 58 km/hr respectively. In how much time will they completely cross each other?
ExplanationCombined length = 100+140 = 240 m. Relative speed (opposite directions) = (50+58) x 5/18 = 30 m/s. Time = 240/30.00 = 8 seconds.
-
Question 44 of 100
A train 100 metres long, running at 45 km/hr, crosses a platform 200 metres long. How long does it take to completely cross the platform?
ExplanationTotal distance to cross platform = train length + platform length = 100+200 = 300 m. Speed = 12.50 m/s. Time = 300/12.50 = 24 seconds.
-
Question 45 of 100
Car A leaves a point travelling at 45 km/hr. Two hours later, Car B leaves the same point in the same direction at 60 km/hr. In how many hours after Car B starts will it catch up with Car A?
ExplanationWhen B starts, A is already 45x2=90 km ahead. Relative speed = 60-45 = 15 km/hr. Time to catch up = 90/15 = 6 hours.
-
Question 46 of 100
A man travels a certain distance at 30 km/hr and returns the same distance at 50 km/hr. Find his average speed for the entire journey.
ExplanationFor equal distances at two speeds, average speed = 2 x S1 x S2 / (S1+S2) = 2x30x50/(30+50) = 37.50 km/hr. (Note: this is NOT the simple average.)
-
Question 47 of 100
For a journey covering equal DISTANCES at two different speeds, the correct average speed is given by:
ExplanationA common error is to average the speeds directly; for equal distances, the correct average speed is the harmonic mean, not the arithmetic mean.
-
Question 48 of 100
Convert a speed of 15 m/s into kilometres per hour.
ExplanationTo convert m/s to km/hr, multiply by 18/5: 15 x 18/5 = 54 km/hr.
-
Question 49 of 100
Two trains, 140 metres and 160 metres long, are running in opposite directions at 45 km/hr and 63 km/hr respectively. In how much time will they completely cross each other?
ExplanationCombined length = 140+160 = 300 m. Relative speed (opposite directions) = (45+63) x 5/18 = 30 m/s. Time = 300/30.00 = 10 seconds.
-
Question 50 of 100
A cyclist rides for equal amounts of time at 45 km/hr and 55 km/hr. Find his average speed for the whole journey.
ExplanationWhen time (not distance) is equal at each speed, average speed IS the simple arithmetic mean: (S1+S2)/2 = (45+55)/2 = 50 km/hr.
-
Question 51 of 100
A train moves at a speed of 72 km/hr for 5 hours. What distance does it cover?
ExplanationDistance = Speed x Time = 72 x 5 = 360 km.
-
Question 52 of 100
If a boat's speed in still water is 'b' km/hr and the stream's speed is 's' km/hr, the boat's upstream speed is:
ExplanationMoving upstream (against the current), the stream speed reduces the boat's effective speed, so upstream speed = b - s.
-
Question 53 of 100
Two trains, 160 metres and 180 metres long, are running in opposite directions at 63 km/hr and 72 km/hr respectively. In how much time will they completely cross each other?
ExplanationCombined length = 160+180 = 340 m. Relative speed (opposite directions) = (63+72) x 5/18 = 37.50 m/s. Time = 340/37.50 = 9.07 seconds.
-
Question 54 of 100
A boat's speed in still water is 18 km/hr, and the speed of the stream is 3 km/hr. Find the boat's downstream speed.
ExplanationDownstream speed = Boat speed + Stream speed = 18+3 = 21 km/hr.
-
Question 55 of 100
Car A leaves a point travelling at 30 km/hr. Two hours later, Car B leaves the same point in the same direction at 50 km/hr. In how many hours after Car B starts will it catch up with Car A?
ExplanationWhen B starts, A is already 30x2=60 km ahead. Relative speed = 50-30 = 20 km/hr. Time to catch up = 60/20 = 3 hours.
-
Question 56 of 100
Convert a speed of 36 km/hr into metres per second.
ExplanationTo convert km/hr to m/s, multiply by 5/18: 36 x 5/18 = 10 m/s.
-
Question 57 of 100
A train moves at a speed of 100 km/hr for 1 1/2 hours. What distance does it cover?
ExplanationDistance = Speed x Time = 100 x 1.5 = 150 km.
-
Question 58 of 100
A boat's speed in still water is 15 km/hr, and the speed of the stream is 3 km/hr. Find the boat's downstream speed.
ExplanationDownstream speed = Boat speed + Stream speed = 15+3 = 18 km/hr.
-
Question 59 of 100
In a 150 metres race, A gives B a head start of 15 metres. If A and B run at the same speed, by how much distance would A need to catch up to tie the race?
ExplanationA must make up exactly the head start distance given to B, which is 15 metres, to draw level by the finish (since both run at equal speed thereafter).
-
Question 60 of 100
A man travels a certain distance at 48 km/hr and returns the same distance at 72 km/hr. Find his average speed for the entire journey.
ExplanationFor equal distances at two speeds, average speed = 2 x S1 x S2 / (S1+S2) = 2x48x72/(48+72) = 57.60 km/hr. (Note: this is NOT the simple average.)
-
Question 61 of 100
In a 300 metres race, A gives B a head start of 30 metres. If A and B run at the same speed, by how much distance would A need to catch up to tie the race?
ExplanationA must make up exactly the head start distance given to B, which is 30 metres, to draw level by the finish (since both run at equal speed thereafter).
-
Question 62 of 100
Car A leaves a point travelling at 50 km/hr. Two hours later, Car B leaves the same point in the same direction at 80 km/hr. In how many hours after Car B starts will it catch up with Car A?
ExplanationWhen B starts, A is already 50x2=100 km ahead. Relative speed = 80-50 = 30 km/hr. Time to catch up = 100/30 = 3 1/3 hours.
-
Question 63 of 100
A man travels a certain distance at 45 km/hr and returns the same distance at 60 km/hr. Find his average speed for the entire journey.
ExplanationFor equal distances at two speeds, average speed = 2 x S1 x S2 / (S1+S2) = 2x45x60/(45+60) = 51.43 km/hr. (Note: this is NOT the simple average.)
-
Question 64 of 100
In a 100 metres race, A gives B a head start of 10 metres. If A and B run at the same speed, by how much distance would A need to catch up to tie the race?
ExplanationA must make up exactly the head start distance given to B, which is 10 metres, to draw level by the finish (since both run at equal speed thereafter).
-
Question 65 of 100
Convert a speed of 72 km/hr into metres per second.
ExplanationTo convert km/hr to m/s, multiply by 5/18: 72 x 5/18 = 20 m/s.
-
Question 66 of 100
How much time will a vehicle take to cover 360 km at a speed of 90 km/hr?
ExplanationTime = Distance / Speed = 360 / 90 = 4 hours.
-
Question 67 of 100
A boat's downstream speed is 20 km/hr and its upstream speed is 10 km/hr. Find the speed of the boat in still water.
ExplanationSpeed in still water = (Downstream + Upstream)/2 = (20+10)/2 = 15 km/hr.
-
Question 68 of 100
Two towns are 400 km apart. A car starts from Town X at 45 km/hr and another car starts from Town Y at the same time, travelling towards Town X at 55 km/hr. After how many hours will the two cars meet?
ExplanationWhen moving towards each other, relative speed = sum of speeds = 45+55 = 100 km/hr. Time to meet = Distance / Relative speed = 400/100 = 4 hours.
-
Question 69 of 100
Convert a speed of 90 km/hr into metres per second.
ExplanationTo convert km/hr to m/s, multiply by 5/18: 90 x 5/18 = 25 m/s.
-
Question 70 of 100
A train moves at a speed of 80 km/hr for 2 1/2 hours. What distance does it cover?
ExplanationDistance = Speed x Time = 80 x 2.5 = 200 km.
-
Question 71 of 100
A car travels 180 km in 3 hours. Find its average speed.
ExplanationSpeed = Distance / Time = 180 / 3 = 60 km/hr.
-
Question 72 of 100
Two towns are 320 km apart. A car starts from Town X at 30 km/hr and another car starts from Town Y at the same time, travelling towards Town X at 50 km/hr. After how many hours will the two cars meet?
ExplanationWhen moving towards each other, relative speed = sum of speeds = 30+50 = 80 km/hr. Time to meet = Distance / Relative speed = 320/80 = 4 hours.
-
Question 73 of 100
A car travels 150 km in 2 1/2 hours. Find its average speed.
ExplanationSpeed = Distance / Time = 150 / 2.5 = 60 km/hr.
-
Question 74 of 100
A boat's speed in still water is 20 km/hr, and the speed of the stream is 4 km/hr. Find the boat's downstream speed.
ExplanationDownstream speed = Boat speed + Stream speed = 20+4 = 24 km/hr.
-
Question 75 of 100
A train 150 metres long, running at 60 km/hr, crosses a platform 250 metres long. How long does it take to completely cross the platform?
ExplanationTotal distance to cross platform = train length + platform length = 150+250 = 400 m. Speed = 16.67 m/s. Time = 400/16.67 = 24 seconds.
-
Question 76 of 100
A man travels a certain distance at 20 km/hr and returns the same distance at 30 km/hr. Find his average speed for the entire journey.
ExplanationFor equal distances at two speeds, average speed = 2 x S1 x S2 / (S1+S2) = 2x20x30/(20+30) = 24 km/hr. (Note: this is NOT the simple average.)
-
Question 77 of 100
A boat's downstream speed is 22 km/hr and its upstream speed is 14 km/hr. Find the speed of the boat in still water.
ExplanationSpeed in still water = (Downstream + Upstream)/2 = (22+14)/2 = 18 km/hr.
-
Question 78 of 100
A man travels a certain distance at 25 km/hr and returns the same distance at 35 km/hr. Find his average speed for the entire journey.
ExplanationFor equal distances at two speeds, average speed = 2 x S1 x S2 / (S1+S2) = 2x25x35/(25+35) = 29.17 km/hr. (Note: this is NOT the simple average.)
-
Question 79 of 100
Car A leaves a point travelling at 36 km/hr. Two hours later, Car B leaves the same point in the same direction at 54 km/hr. In how many hours after Car B starts will it catch up with Car A?
ExplanationWhen B starts, A is already 36x2=72 km ahead. Relative speed = 54-36 = 18 km/hr. Time to catch up = 72/18 = 4 hours.
-
Question 80 of 100
Car A leaves a point travelling at 40 km/hr. Two hours later, Car B leaves the same point in the same direction at 60 km/hr. In how many hours after Car B starts will it catch up with Car A?
ExplanationWhen B starts, A is already 40x2=80 km ahead. Relative speed = 60-40 = 20 km/hr. Time to catch up = 80/20 = 4 hours.
-
Question 81 of 100
A car travels 420 km in 7 hours. Find its average speed.
ExplanationSpeed = Distance / Time = 420 / 7 = 60 km/hr.
-
Question 82 of 100
Two towns are 500 km apart. A car starts from Town X at 60 km/hr and another car starts from Town Y at the same time, travelling towards Town X at 40 km/hr. After how many hours will the two cars meet?
ExplanationWhen moving towards each other, relative speed = sum of speeds = 60+40 = 100 km/hr. Time to meet = Distance / Relative speed = 500/100 = 5 hours.
-
Question 83 of 100
A car travels 240 km in 4 hours. Find its average speed.
ExplanationSpeed = Distance / Time = 240 / 4 = 60 km/hr.
-
Question 84 of 100
To convert a speed from m/s to km/hr, you should multiply by:
ExplanationSince 1 m/s = 3600/1000 km/hr = 18/5 km/hr, multiplying by 18/5 converts m/s to km/hr.
-
Question 85 of 100
Two trains, 120 metres and 130 metres long, are running in opposite directions at 45 km/hr and 54 km/hr respectively. In how much time will they completely cross each other?
ExplanationCombined length = 120+130 = 250 m. Relative speed (opposite directions) = (45+54) x 5/18 = 27.50 m/s. Time = 250/27.50 = 9.09 seconds.
-
Question 86 of 100
Convert a speed of 54 km/hr into metres per second.
ExplanationTo convert km/hr to m/s, multiply by 5/18: 54 x 5/18 = 15 m/s.
-
Question 87 of 100
A car travels 280 km in 4 hours. Find its average speed.
ExplanationSpeed = Distance / Time = 280 / 4 = 70 km/hr.
-
Question 88 of 100
When two objects move towards each other, their relative speed is found by:
-
Question 89 of 100
Convert a speed of 12 m/s into kilometres per hour.
ExplanationTo convert m/s to km/hr, multiply by 18/5: 12 x 18/5 = 43.20 km/hr.
-
Question 90 of 100
A boat's downstream speed is 28 km/hr and its upstream speed is 18 km/hr. Find the speed of the stream.
ExplanationSpeed of stream = (Downstream - Upstream)/2 = (28-18)/2 = 5 km/hr.
-
Question 91 of 100
When a train crosses a stationary object like a pole or a standing person, the distance covered is equal to:
ExplanationSince a pole/person has negligible length, the train only needs to cover its own length to completely pass it.
-
Question 92 of 100
How much time will a vehicle take to cover 150 km at a speed of 50 km/hr?
ExplanationTime = Distance / Speed = 150 / 50 = 3 hours.
-
Question 93 of 100
A car travels 200 km in 5 hours. Find its average speed.
ExplanationSpeed = Distance / Time = 200 / 5 = 40 km/hr.
-
Question 94 of 100
A train 150 metres long is running at 60 km/hr. How long will it take to cross a stationary pole (or a man standing still)?
ExplanationSpeed in m/s = 60 x 5/18 = 16.67 m/s. Time to cross a pole = Train length / Speed = 150 / 16.67 = 9 seconds.
-
Question 95 of 100
A boat's speed in still water is 12 km/hr, and the speed of the stream is 2 km/hr. Find the boat's downstream speed.
ExplanationDownstream speed = Boat speed + Stream speed = 12+2 = 14 km/hr.
-
Question 96 of 100
A car travels 360 km in 6 hours. Find its average speed.
ExplanationSpeed = Distance / Time = 360 / 6 = 60 km/hr.
-
Question 97 of 100
When two objects move in the same direction, their relative speed is found by:
-
Question 98 of 100
How much time will a vehicle take to cover 240 km at a speed of 60 km/hr?
ExplanationTime = Distance / Speed = 240 / 60 = 4 hours.
-
Question 99 of 100
A boat's speed in still water is 25 km/hr, and the speed of the stream is 5 km/hr. Find the boat's downstream speed.
ExplanationDownstream speed = Boat speed + Stream speed = 25+5 = 30 km/hr.
-
Question 100 of 100
Two towns are 300 km apart. A car starts from Town X at 40 km/hr and another car starts from Town Y at the same time, travelling towards Town X at 60 km/hr. After how many hours will the two cars meet?
ExplanationWhen moving towards each other, relative speed = sum of speeds = 40+60 = 100 km/hr. Time to meet = Distance / Relative speed = 300/100 = 3 hours.
0 / 100 answered · 0 skipped
You can practise as a guest, but sign in to save your score and track your progress.