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Discussion :: Problems on Trains

  1. 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 (in seconds) which they take to cross each other, is:

    2. A.
    9
    B.
    9.6
    C.
    10
    D.
    10.8

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    Answer : Option D

    Explanation :

    Relative speed = (60 + 40) km/hr = 1-sym-oparen-h1 100 x 5 1-sym-cparen-h1m/sec = 1-sym-oparen-h1 250 1-sym-cparen-h1m/sec.
    18 9

    Distance covered in crossing each other = (140 + 160) m = 300 m.

    Required time = 1-sym-oparen-h1 300 x 9 1-sym-cparen-h1sec = 54 sec = 10.8 sec.
    250 5

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