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

55

km/hr

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57

km/hr

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60

km/hr

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63

km/hr

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Solution

The correct option is C $60$ km/hr
Number or gaps between 21 telephone posts $= 20$
Distance travelled in 1 minute $= (50 \times 20) m = 1000 m = 1 k m$
Speed of the train travelling is $= 60 k m / h r$

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