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 How long will a boy take to run round a square field of side 35 meters, If he runs at the rate of 9 km/hr?

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Speed = 9 km/hr = 9 x (5/18) m/sec = 5/2 m/sec

Distance = (35 x 4) m = 140 m.

Time taken = 140 x (2/5) sec= 56 sec

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