Question:A train X starts from the same place at the speed of 50 km/hr.After how much time will Y cross X ? 

A 3 hrs 
B `2 3/4 hrs` 
C `3 1/2 hrs` 
D `2 1/4 hrs` 

+ Answer
C 

+ Explanation
Suppose they cross after x hours.

Distance covered by Y in (x - 1) hours = Distance covered by X in x hours 

70 (x - 1) = 50 x =>x = 3 1/2`

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Irin Moni

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