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    Question

    Train X of length 180 m and Train Y of length 120 m are

    moving in opposite directions at 8 m/sec and 7 m/sec respectively. In how much time will they completely cross each other?
    A 20 secs Correct Answer Incorrect Answer
    B 18 secs Correct Answer Incorrect Answer
    C 22 secs Correct Answer Incorrect Answer
    D 10 secs Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ,

    Relative speed = 8 + 7 = 15 m/sec

    Time taken to cross = (180 + 120) / 15 = 300 / 15 = 20 seconds

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