A train passes by a lamp post on a platform in 7 sec. and passes by – McqOptions

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1.	A train passes by a lamp post on a platform in 7 sec. and passes by the platform completely in 28 sec. if the length of the platform is 390 m. then length of the train (in metres) is
A.	120
B.	130
C.	140
D.	150
Answer» C. 140

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