Question
A person is walking at 4 m/sec in the same direction of
a train. The train crosses him in 7 seconds. If train speed is 72 km/hr, find the time to cross a bridge of 84 metres.Solution
Train speed = 72 Ă— (5/18) = 20 m/sec
Relative speed = 20 - 4 = 16 m/sec
L / 16 = 7 ⇒ L = 112 metres
Time to cross bridge = (112 + 84)/20 = 196/20 = 9.8 seconds
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