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April 30 2018
Question A man is standing on a railway bridge which is 180 m long. He finds that a train crossed the bridge in 20 sec but himself in 8 seconds. Find the length of the train and its speed?

Let the length of the train be x meters

Then, the train covers x meter in 8 seconds and (x + 180) meters in 20 seconds.

Therefore x/8 = (x + 180)/20 => 20x = 8(x + 180) => x = 120.

Therefore the speed of train = 120m

Speed of train = 120/8 m/sec = 15 m/sec = 15 * (18/5) kmph = 54 kmph




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