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Two trains 140 m and 160 m long run at the speed of 60 km/hr and 40 km/hr respectively in opposite directions on parallel tracks. The time which they take to cross each other, is

A. 9.8 seconds

B. 10.8 seconds

C. 11.8 seconds

D. 12.8 seconds

Correct Answer : B.


Relative Speed = 60+40 = 100 kmph
= 100*(5/18) = 250/9 m/sec
Distance = 140+160 = 300 meters
Time = Distance/Speed
300×9250=545=10.8 seconds
So the time trains will take to cross each other will be 10.8 seconds

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