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October 05 2017
Question Two trains 200mtr and 150mtr are running on the parallel rails at the rate of 40kmph and 45kmph respectively. In how much time will they cross each other if they are running in the same direction.
Answer

Relative speed of the train = 45 - 40 = 5 km/hr = 25/18 m/sec

and the total distance covered = sum of lengths of trains  = 350 m

So, tome taken = 350 * (18/25) = 252 sec

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