A car runs at 50 km/h for 3 hours and then tracks at 70 km/h for the next 2 hours. Find the average speed across the whole route. MCQ with Answer and Explanation
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Question #1
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A car covers a distance of 180 km in 3 hours. What should be the increase in its speed to cover the same distance in 2 hours?
Correct Answer: Option B
Explanation:
Original speed = 180 / 3 = 60 km/h. Required speed = 180 / 2 = 90 km/h. Increase = 90 - 60 = 30 km/h.
Original speed = 180 / 3 = 60 km/h. Required speed = 180 / 2 = 90 km/h. Increase = 90 - 60 = 30 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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Two trains 150m and 170m long are running towards each other on parallel tracks at speeds of 42 km/h and 30 km/h respectively. In what time will they clear each other?
Correct Answer: Option B
Explanation:
Total distance = 150 + 170 = 320 meters. Relative speed = 42 + 30 = 72 km/h = 72 * (5/18) = 20 m/s. Time taken = 320 / 20 = 16 seconds.
Total distance = 150 + 170 = 320 meters. Relative speed = 42 + 30 = 72 km/h = 72 * (5/18) = 20 m/s. Time taken = 320 / 20 = 16 seconds.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A train traveling at 72 km/h crosses a platform 160 meters long in 18 seconds. Find the length of the train.
Correct Answer: Option C
Explanation:
Speed = 72 * (5/18) = 20 m/s. Total distance in 18 seconds = 20 * 18 = 360 meters. Train length + Platform length = 360 => Train length + 160 = 360 => Train length = 200 meters.
Speed = 72 * (5/18) = 20 m/s. Total distance in 18 seconds = 20 * 18 = 360 meters. Train length + Platform length = 360 => Train length + 160 = 360 => Train length = 200 meters.
This question belongs to:
Maths
Time Speed and Distance
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