A train passes by a lamp post at platform in 7 sec. and passes by the platform c

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A train passes by a lamp post at platform in 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?

Options:

A . 120 m

B . 130 m

C . 140 m

D . 150 m

Answer: Option B

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