Question
Two trains A and B, were proceeding in the same
direction on parallel tracks at 23 km/hr and 77 km/hr respectively. A man noticed that it took exactly 15 seconds for the faster train to pass by him. What is the length of the faster train?Solution
Relative speed = (77 – 23) km/hr = 54 km/hr => 54 × (5/18) = 15 m/sec Length of the faster train = 15 × 15 = 225 m
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