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    Question

    Priya is sitting inside train C which is travelling at a

    speed of 48 km/h. Another train D, whose length is five times the length of train C and travelling with a speed of 54 km/h (in opposite direction to that of train C) crosses Priya in 20 seconds. Find the length of train C (in metres).
    A 113 Correct Answer Incorrect Answer
    B 255 Correct Answer Incorrect Answer
    C 440 Correct Answer Incorrect Answer
    D 590 Correct Answer Incorrect Answer

    Solution

    ATQ,

    Relative speed = 48 + 54 = 102 km/h = 102 ├Ч 5/18 = 28.33 m/s

    Let the length of train C be тАШxтАЩ meters

    So, 5x = 28.33 ├Ч 20

    Or, 5x = 566.6

    Or, x = 113.32 тЙИ 113 metres

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