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    Question

    Length of Madhubani Express is (x + 40) m, and it can cross

    a platform of length (x – 40) m in 40 seconds with a speed of 24 m/s. Find the time taken by Madhubani Express to cross another train of same length which is running at a speed of 28 m/s in the opposite direction towards it.
    A 10 sec Correct Answer Incorrect Answer
    B 20 sec Correct Answer Incorrect Answer
    C 15 sec Correct Answer Incorrect Answer
    D 12 sec Correct Answer Incorrect Answer
    E 30 sec Correct Answer Incorrect Answer

    Solution

    Speed of Madhubani Express = [(x + 40) + (x – 40)]/40 m/s

    According to question,

    [(x + 40) + (x – 40)]/40 = 24

    2x = 960, x = 960/2 = 480

    So, length of Madhubani Express = 480 + 40 = 520 m

    Therefore, required time = (520 + 520)/ (24 + 28) = 1040/52 = 20 seconds

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