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 3.5t seconds, then what is the length of the platform? Choose the correct choice from the following answers:  A) 0.5L  B) 1.5L  C) 2.5L  D) 3.5L  E) 4.5L
The train passes a pole in t seconds, so velocity v = L/t   (L+P)/v = 3.5t   (L+P) / (L/t) = 3.5t   P = 2.5L   The answer is 2.5L.
<result>C</result>
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 3.5t seconds, then what is the length of the platform?