Question

The area of rectangular field is 3584 my sq and it's length is 64 m . a boy runs around the field at the rate of 8 km per hour how long will he take to go 5 times around it?

Answer 1

Breadth of the field = Area/length = 3584/64 = 56m

Perimeter of the field = 2(l + b)
= 2 (64 + 56)
= 2 * 120
= 240 m

Distance he will cover in 1 round = 240 m = 0.24 km
Distance he will cover in 5 rounds = 0.24 * 5 = 1.2 km

Time taken = Distance / speed = 1.2 / 8 = 0.15 hour

I hour = 60 min
0.15 hours = 0.15 * 60
= 9 min