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 6t seconds, then what is the length of the platform?  Choose the correct choice from the following.
A) L	B) 3L	C) 5L	D) 7L	E) 9L
The train passes a pole in t seconds, so velocity v = L/t   (L+P)/v = 6t   (L+P) / (L/t) = 6t   P = 5L   The answer is 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 6t seconds, then what is the length of the platform?