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    Question

    Kiran is sitting inside train X which is travelling at a

    speed of 55 km/h. Another train Y, whose length is four times the length of train X and travelling with a speed of 60 km/h (in opposite direction to that of train X) crosses Kiran in 18 seconds. Find the length of train X (in metres).
    A 217 Correct Answer Incorrect Answer
    B 255 Correct Answer Incorrect Answer
    C 144 Correct Answer Incorrect Answer
    D 295 Correct Answer Incorrect Answer

    Solution

    ATQ,

    Relative speed = 55 + 60 = 115 km/h = 115 × 5/18 = 31.94 m/s

    Let the length of train X be ‘x’ meters

    So, 4x = 31.94 × 18

    Or, 4x = 575

    Or, x = 143.75 ≈ 144 metres

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