A train of length L is traveling at a constant velocity and passes a pole in t seconds. If the same train travelling at the same velocity passes a platform in 5t seconds, then what is the length of the platform?  Select the correct option:  A) L  B) 2L  C) 3L  D) 4L  E) 5L
The train passes a pole in t seconds, so velocity v = L/t   (L+P)/v = 5t   (L+P) / (L/t) = 5t   P = 4L   The answer is 4L.
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A train of length L is traveling at a constant velocity and passes a pole in t seconds. If the same train travelling at the same velocity passes a platform in 5t seconds, then what is the length of the platform?