A man in a train notices that he can count 21...

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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 ?

A. 55 km/hr

B. 57 km/hr

C. 60 km/hr

D. 63 km/hr

Answer: Option C

Solution(By Examveda Team)

Number of gaps between 21 telephone posts = 20
Distance travelled in 1 minute
= (50 × 20) m
= 1000 m
= 1 km
∴ Speed = 60 km/hr

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