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man is standing on a railway bridge which is 180 mlong. He finds that a train crosses the bridge in 20 sec-onds but himself in 8 seconds. Find the length of thetrain and its speed.A. 36B. 54I. AC. 67D. 76 |
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Answer» Sol. Let the length of the train be x metres.Then, the train covers x metres in 8 seconds and (x + 180) metres in 20 seconds.:. X/8 = (x + 180)/20 20x=8(x +180) x=120:. Length of train = 120m.Speed of train = (120/8) m/sec = 15 m/sec = [15 X 18/5 ] Kmph = 54 Kmph. |
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