13. 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?13. 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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Step-by-step explanation:
Step-by-step explanation:Boy covered a distance of 9000 meters (9 km = 9*1000= 9000 meters) in one hour. That's 60 minutes. For covering a distance of 9000 meters he took 60 minutes. Hence for 140 meters he will take time = 60 / 9000 * 140 = 14 / 15 minutes = 14 * 60 /15 = 56 seconds.
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