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Discussion :: Problems on Trains

  1. Two trains are running at 40 km/hr and 20 km/hr respectively in the same direction. Fast train completely passes a man sitting in the slower train in 5 seconds. What is the length of the fast train?

    2. A.
    23 m
    B.
    23 2/9 m
    C.
    27 7/9 m
    D.
    29 m

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    Answer : Option C

    Explanation :

    Relative speed = (40 - 20) km/hr = 1-sym-oparen-h1 20 x 5 1-sym-cparen-h1 m/sec = 1-sym-oparen-h1 50 1-sym-cparen-h1 m/sec.
    18 9
    Therefore Length of faster train = 1-sym-oparen-h1 50 x 5 1-sym-cparen-h1 m = 250 m = 27 7 m.
    9 9 9

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