A train passes by a lamp post at platformin 7 sec. and passes by the platform completely in 28 sec. If the length of the platform is 390m, then length of the train (in meters) is?

A train passes by a lamp post at platformin 7 sec. and passes by the p

1.	A train passes by a lamp post at platformin 7 sec. and passes by the platform completely in 28 sec. If the length of the platform is 390m, then length of the train (in meters) is?
A.	20 m
B.	30 m
C.	40 m
D.	50 m
Answer» C. 40 m

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A train passes by a lamp post at platformin 7 sec. and passes by the platform completely in 28 sec. If the length of the platform is 390m, then length of the train (in meters) is?

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