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. MCQ with Answer and Explanation
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Question #1
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A vessel tracks upstream at 10 km/h and downstream at 18 km/h. Find the net speed of the river current.
Correct Answer: Option D
Explanation:
Speed of river current = (Downstream speed - Upstream speed) / 2 = (18 - 10) / 2 = 8 / 2 = 4 km/h.
Speed of river current = (Downstream speed - Upstream speed) / 2 = (18 - 10) / 2 = 8 / 2 = 4 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A motorboat maps 32 km downstream in 2 hours and tracks the same upriver stretch upstream in 4 hours. Find the baseline speed of the boat hull in still water.
Correct Answer: Option C
Explanation:
Downstream speed = 32 / 2 = 16 km/h. Upstream speed = 32 / 4 = 8 km/h. Speed in still water = (16 + 8) / 2 = 12 km/h.
Downstream speed = 32 / 2 = 16 km/h. Upstream speed = 32 / 4 = 8 km/h. Speed in still water = (16 + 8) / 2 = 12 km/h.
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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