A sonic pulse registers a speed of 340 m/s. How many seconds will it take to span a straight distance line of 8.5 km? MCQ with Answer and Explanation
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Question #1
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A train 150 meters long completely passes a stone in 15 seconds. Find the speed of the train in km/h.
Correct Answer: Option D
Explanation:
Speed of train = 150 / 15 = 10 m/s. In km/h = 10 * (18/5) = 36 km/h.
Speed of train = 150 / 15 = 10 m/s. In km/h = 10 * (18/5) = 36 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A train passes a standing track worker in 12 seconds and crosses a platform 200 meters long in 22 seconds. Find the length of the train.
Correct Answer: Option C
Explanation:
Time taken to cross platform alone = 22 - 12 = 10 seconds. Speed of train = 200 / 10 = 20 m/s. Length of train = Speed * Time to cross worker = 20 * 12 = 240 meters.
Time taken to cross platform alone = 22 - 12 = 10 seconds. Speed of train = 200 / 10 = 20 m/s. Length of train = Speed * Time to cross worker = 20 * 12 = 240 meters.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A boat moves upstream at 6 km/h and downstream at 12 km/h. Find the speed of the river current.
Correct Answer: Option A
Explanation:
Speed of the river current = (Downstream speed - Upstream speed) / 2 = (12 - 6) / 2 = 6 / 2 = 3 km/h.
Speed of the river current = (Downstream speed - Upstream speed) / 2 = (12 - 6) / 2 = 6 / 2 = 3 km/h.
This question belongs to:
Maths
Time Speed and Distance
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