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    Question

    Train A (180 m) runs at 60 km/h. Train B (270 m) runs at

    90 km/h in the opposite direction. Find the time taken to cross each other completely.
    A 12.5 secs Correct Answer Incorrect Answer
    B 0.12 secs Correct Answer Incorrect Answer
    C 10.8 sec Correct Answer Incorrect Answer
    D 15.5 secs Correct Answer Incorrect Answer

    Solution

    Relative speed = 60 + 90 = 150 km/h = 150 Ă— 1000 / 3600 = 41.67 m/s. Distance = 180 + 270 = 450 m. Time = 450 / 41.67 = 10.8 s.

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