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Discussion

  1. Two trains running at 36 km/hr and 54 km/hr are running parallel in the opposite direction. If their lengths are 200m and 300m respectively. Then how much time will they take to cross each other?
    1. 20 sec
    2. 25 sec
    3. 30 sec
    4. 35 sec
  1. Correct Option: A

    Relative speed, when the trains are running in the opposite direction = Sum of the speed

    Therefore, Relative speed = 36 km/hr +72 km/hr = 90 km/hr
    Relative speed in m/sec = 90 km/hr x 5/18= 25 m/sec

    Distance covered = sum of the lengths of the train = 200 m+ 300 m = 500m
    Therefore, time taken = 500m / 25 m/sec = 20 sec

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