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    Question

    Two trains 110 metres and 100 metres in length are

    running towards each other on parallel tracks, one at the rate 75 km/hr and another at 51 km/hr. In how many seconds will they be clear of each other from the moment they meet?
    A 14 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 = 75 + 51 = 126 kmph = (126 × 5)/18 = 35 m/sec Required time = (110 + 100)/35 = 110/35 = 6 seconds

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