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    Question

    A train 180 m long passes a stationary pole in 15

    seconds and crosses a platform in 27 seconds. Find the length of the platform.
    A 103 m Correct Answer Incorrect Answer
    B 252 m Correct Answer Incorrect Answer
    C 144 m Correct Answer Incorrect Answer
    D 127 m Correct Answer Incorrect Answer

    Solution

    Speed of train = distance / time while passing pole = 180 / 15 = 12 m/s When crossing a platform, distance covered = length of train + length of platform. Let platform length = L. Time to cross platform = 27 s. So: (180 + L)/27 = 12 180 + L = 12 × 27 = 324 L = 324 − 180 = 144 m Answer: Length of platform = 144 m.

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