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 3t seconds then what is the length of the platform:
A) 0.5 L
C) 1.5 L
D) 2 L
E) 3 L
Length of train=Distance=L
time to cross the pole=time=t
new time=3t. so distance travelled= 3t*L/t = 3L
the distance is equal to train length L+platform length = 3L
so platform is 2L. ans is D.
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