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    Question

    A train 150 m long crosses a pole in 12 seconds. It also

    crosses a platform in 32 seconds. Find the length of the platform.
    A 250 m Correct Answer Incorrect Answer
    B 330 m Correct Answer Incorrect Answer
    C 225 m Correct Answer Incorrect Answer
    D 200 m Correct Answer Incorrect Answer

    Solution

    Speed from pole: Speed = Distance / Time = 150 / 12 = 12.5 m/s Convert to km/h: 12.5 Γ— (18/5) = 12.5 Γ— 3.6 = 45 km/h Let platform length = L. When crossing the platform, distance = 150 + L Time = 32 s β‡’ (150 + L)/32 = 12.5 β‡’ 150 + L = 12.5 Γ— 32 = 400 β‡’ L = 400 βˆ’ 150 = 250 m Answer: Platform length = 250 m

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