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 ?

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

1.	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 ?
A.	5 km/hr
B.	7 km/hr
C.	0 km/hr
D.	3 km/hr
Answer» D. 3 km/hr

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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 ?

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