Excluding stoppages, the speed of an express train is 60 km/h and including stoppages it is 48 km/h. For how many minutes does the train stop per hour? MCQ with Answer and Explanation
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Question #1
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The speeds of two cars are in the ratio 5 : 4. If they cover the same distance, and the slower car takes 2.5 hours, how much time does the faster car take?
Correct Answer: Option D
Explanation:
Ratio of speeds = 5:4, so ratio of times taken = 4:5. The slower car corresponds to 5 parts = 2.5 hours => 1 part = 0.5 hours. Time for the faster car = 4 parts = 4 * 0.5 = 2 hours.
Ratio of speeds = 5:4, so ratio of times taken = 4:5. The slower car corresponds to 5 parts = 2.5 hours => 1 part = 0.5 hours. Time for the faster car = 4 parts = 4 * 0.5 = 2 hours.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A truck covers three successive 8 km stretches at uniform speed metrics of 12 km/h, 24 km/h and 24 km/h. Find its net average speed.
Correct Answer: Option B
Explanation:
Total distance covered = 3 * 8 = 24 km. Total time taken = 8/12 + 8/24 + 8/24 = 2/3 + 1/3 + 1/3 = 4/3 hours. Average speed = 24 / (4/3) = 24 * 3 / 4 = 6 * 3 = 18 km/h.
Total distance covered = 3 * 8 = 24 km. Total time taken = 8/12 + 8/24 + 8/24 = 2/3 + 1/3 + 1/3 = 4/3 hours. Average speed = 24 / (4/3) = 24 * 3 / 4 = 6 * 3 = 18 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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The speed of two bodies are in the ratio 3 : 5. If they cover the same distance, what is the ratio of the time taken by them?
Correct Answer: Option A
Explanation:
Since time is inversely proportional to speed when distance is constant, the ratio of time taken is the reciprocal of the speed ratio: 1/3 : 1/5 = 5 : 3.
Since time is inversely proportional to speed when distance is constant, the ratio of time taken is the reciprocal of the speed ratio: 1/3 : 1/5 = 5 : 3.
This question belongs to:
Maths
Time Speed and Distance
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