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    Question

    Ravi is sitting inside train M which is travelling at a

    speed of 45 km/h. Another train N, whose length is half the length of train M and travelling with a speed of 65 km/h (in opposite direction to that of train M) crosses Ravi in 10 seconds. Find the length of train M (in metres).
    A 417 Correct Answer Incorrect Answer
    B 255 Correct Answer Incorrect Answer
    C 611 Correct Answer Incorrect Answer
    D 590 Correct Answer Incorrect Answer

    Solution

    ATQ,

    Relative speed = 45 + 65 = 110 km/h = 110 × 5/18 = 30.56 m/s

    Let the length of train M be ‘x’ meters

    So, 0.5x = 30.56 × 10

    Or, 0.5x = 305.6

    Or, x = 611.2 ≈ 611 metres

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