A man in a train notices that he can count 21 telephone posts in one minute.If they are known to be 50 meters apart , then at what speed is the train travelling ?

A man in a train notices that he can count 21 telephone posts in on

1.	A man in a train notices that he can count 21 telephone posts in one minute.If they are known to be 50 meters apart , then at what speed is the train travelling ?
A.	55 km/hr
B.	57 km/hr
C.	60 km/hr
D.	63 km/hr
Answer» D. 63 km/hr

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A man in a train notices that he can count 21 telephone posts in one minute.If they are known to be 50 meters apart , then at what speed is the train travelling ?

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