A man in a train notices that he can count 21 telephone posts in one minutes. If

Question

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

Options:

A . 55 km/hr

B . 57 km/hr

C . 60 km/hr

D . 63 km/hr

Answer: Option C

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