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    Question

    Two trains 180 metres and 120 metres in length are

    running towards each other on parallel tracks, one at the rate 42 km/hr and another at 30 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 11 seconds Correct Answer Incorrect Answer

    Solution

    Required time = Sum of the lengths of trains / Relative speed Relative speed = 42 + 30 = 72 kmph = (72 × 5)/18 = 20 m/sec Required time = (180 + 120)/20 = 300/20 = 15 seconds

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