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A train of length l, traveling at a constant velocity, passes a pole in t seconds .If the same train traveling at the same velocity passes a platform in 3t seconds, then the length of the platform is-------

Correct Answer: l
Total time difference = 3t - t = 2t In time t second train passed l length ⸫ " " 1 " " " lt length ⸫ " " 2t " " " l×2tt " = 21 " Travelling distance = length of train + length of platform ⇒ 2l = 1 + length of platform ⸫ length of platform = 2l - 1 = 1

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