Two Passenger trains 140m and 180m long are running in the same direction with the speed of 126kmph ...........

Quantitative Aptitude (CDS) Problems on trains

Two Passenger trains 140m and 180m long are running in the same direction with the speed of 126kmph and 54kmph. In how much time will the first train cross the second?

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Explanation:

Total distance to covered = (140+180)m = 320m
Relative speed of the Passenger train = (126-54)kmph = 72kmph
= 72(5/18) m/sec = 20 m/sec
Time taken by the Passenger train to cross each other
= Time taken to cover 320m at 20m/sec
= 320/20sec = 16sec