a man is going at 2 km per hour ana another man at 4 km per hour in the same direction of the railway line .coming from behind a train takes 9 sec and 10 sec respectively to cross them
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a man is going at 2 km per hour ana another man at 4 km per hour in the same direction of the railway line .coming from behind a train takes 9 sec and 10 sec respectively to cross them
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