A driver covers 30% of his total route at 30 km/h and the remaining 70% at 42 km/h. What is his average speed for the full trip? MCQ with Answer and Explanation
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Question #1
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A train 150 meters long is tracking at a speed of 72 km/h. How long will it take to pass a bridge 250 meters long?
Correct Answer: Option D
Explanation:
Total distance = 150 + 250 = 400 meters. Speed = 72 * (5/18) = 20 m/s. Time taken = 400 / 20 = 20 seconds.
Total distance = 150 + 250 = 400 meters. Speed = 72 * (5/18) = 20 m/s. Time taken = 400 / 20 = 20 seconds.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A train passes a standing person on a platform in 8 seconds and crosses the platform itself, which is 240 meters long, in 20 seconds. Find the length of the train.
Correct Answer: Option C
Explanation:
Time taken to cross the platform distance alone = 20 - 8 = 12 seconds. Speed of the train = 240 / 12 = 20 m/s. Length of the train = Speed * Time to pass the person = 20 * 8 = 160 meters.
Time taken to cross the platform distance alone = 20 - 8 = 12 seconds. Speed of the train = 240 / 12 = 20 m/s. Length of the train = Speed * Time to pass the person = 20 * 8 = 160 meters.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A crew can row 40 km downstream in 4 hours and 20 km upstream in 5 hours. Find the speed of the stream.
Correct Answer: Option A
Explanation:
Downstream speed = 40 / 4 = 10 km/h. Upstream speed = 20 / 5 = 4 km/h. Speed of the stream = (Downstream speed - Upstream speed) / 2 = (10 - 4) / 2 = 6 / 2 = 3 km/h.
Downstream speed = 40 / 4 = 10 km/h. Upstream speed = 20 / 5 = 4 km/h. Speed of the stream = (Downstream speed - Upstream speed) / 2 = (10 - 4) / 2 = 6 / 2 = 3 km/h.
This question belongs to:
Maths
Time Speed and Distance
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