Question
A man in a train notice that he can count 21 telephone posts in one minute . If hey are know to be 50 metres apart , then at what speed is the train travelling ?
Answer: Option C
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Number of gaps between 21 telephone posts = 20.
Distance travelled in 1 minute = (50 x 60) m = 1000 m = 1 km.
`:.` Speed = 60 km/hr.
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