Question
A boy is cycling at a speed of 6 m/sec in the same
direction of the train. Train crosses the boy in 5 seconds. If speed of the train is 90 km/hr, then find the time taken by train to cross a platform of length 105 metres.Solution
Train speed = 90 × (5/18) = 25 m/sec
Relative speed = 25 - 6 = 19 m/sec
L / 19 = 5 ⇒ L = 95 metres
Time to cross platform = (95 + 105)/25 = 200/25 = 8 seconds
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