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 2t seconds, then what is the length of the platform?	Select the correct option:  A) 0.5 L  B) L  C) 1.5 L  D) 2 L  E) 3
The train passes a pole in t seconds, so velocity v = L/t   (L+P)/v = 2t   (L+P) / (L/t) = 2t   P = L   The answer is L.
<result>B</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 2t seconds, then what is the length of the platform?