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 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

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