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    Question

    Train 'A' having a speed of 18 m/s can cross a man in 10

    seconds. The length of train 'B' is 120 metres more than the length of 'A'. If the speed of 'B' is 42 m/sec and both trains are travelling towards each other, then find the time taken by them to cross each other.
    A 7.0 seconds Correct Answer Incorrect Answer
    B 7.5 seconds Correct Answer Incorrect Answer
    C 8.0 seconds Correct Answer Incorrect Answer
    D 8.5 seconds Correct Answer Incorrect Answer
    E 9.0 seconds Correct Answer Incorrect Answer

    Solution

    Length of train 'A' = 18 ├Ч 10 = 180 metres
    Length of train 'B' = 180 + 120 = 300 metres
    Relative speed = 18 + 42 = 60 m/sec
    Required time = (180 + 300) ├╖ 60 = 480 ├╖ 60 = 8.0 seconds

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