A train running at a speed of 40 m/s crosses a pole in 21 sec less – McqOptions

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1.	A train running at a speed of 40 m/s crosses a pole in 21 sec less than the time it requires to cross a bridge 3.5 times its length at the same speed. What is the length of the bridge ?
A.	560 m
B.	660 m
C.	720 m
D.	840 m
Answer» E.

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