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    Question

    Two trains 165 metres and 135 metres in length are

    running towards each other on parallel tracks, one at the rate 70 km/hr and another at 38 km/hr. In how many seconds will they be clear of each other from the moment they meet?
    A 12 seconds Correct Answer Incorrect Answer
    B 10 seconds Correct Answer Incorrect Answer
    C 15 seconds Correct Answer Incorrect Answer
    D 6 seconds Correct Answer Incorrect Answer
    E 9 seconds Correct Answer Incorrect Answer

    Solution

    Required time = Sum of the lengths of trains / Relative speed Relative speed = 70 + 38 = 108 kmph = (108 × 5)/18 = 30 m/sec Required time = (165 + 135)/30 = 300/30 = 10 seconds

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