Question

A person walks at the rate of 4 km per hour. How long will he take to go around a square Park 5 times, whose area is 2500 m square?

Answer 1

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 = 1km to travel.
his speed = 4 km/hr

Speed =distance /time
So time = distance / speed = 1/4 hour= 60/4minutes
He needs 15 minutes to go 5 round of the park.