A person walks at the rate of a 4 km/h. How long he will take to go round a square park 5 times whose areas is 2500 m sq.
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Area of Square Park = 2500 sq m.
Side of the park = sq rt of 2500 = 50 m.
Perimeter of the square = 4*50 = 200 m.
In round he has to travel 200 m.
So, in 5 round, he needs 5 * 200 = 1000 m to travel.
He needs 15 minutes to go 5 round of the park.