A man can row 12 km/h in still water. He finds that it takes him twice as long to row upstream as to row downstream. Find the speed of the stream. MCQ with Answer and Explanation
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Question #1
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A train passes a static platform signal mast in 15 seconds and clears the 250-meter platform sector itself in 25 seconds. Find the length of the train.
Correct Answer: Option B
Explanation:
Time allocated to clear the platform alone = 25 - 15 = 10 seconds. Speed of train = 250 / 10 = 25 m/s. Length of train = Speed * Time to pass mast = 25 * 15 = 375 meters.
Time allocated to clear the platform alone = 25 - 15 = 10 seconds. Speed of train = 250 / 10 = 25 m/s. Length of train = Speed * Time to pass mast = 25 * 15 = 375 meters.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A man rows upstream 10 km and downstream 22 km, taking 3 hours each way. Find the speed of the current.
Correct Answer: Option C
Explanation:
Upstream speed = 10 / 3 = 3.33 km/h. Downstream speed = 22 / 3 = 7.33 km/h. Speed of current = (Downstream speed - Upstream speed) / 2 = (7.33 - 3.33) / 2 = 4 / 2 = 2 km/h.
Upstream speed = 10 / 3 = 3.33 km/h. Downstream speed = 22 / 3 = 7.33 km/h. Speed of current = (Downstream speed - Upstream speed) / 2 = (7.33 - 3.33) / 2 = 4 / 2 = 2 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A train 120 meters long running at 54 km/h passes a standing pedestrian. Find the time taken to cross.
Correct Answer: Option A
Explanation:
Speed of train = 54 * (5/18) = 15 m/s. Time taken = 120 / 15 = 8 seconds.
Speed of train = 54 * (5/18) = 15 m/s. Time taken = 120 / 15 = 8 seconds.
This question belongs to:
Maths
Time Speed and Distance
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