Question

The length and breadth of a playground are 75 m 20 cm and 34 m 80 cm . Find the cost of levelling it at the rate rupees 1.50 per square metre.

Answer 1

Given length of playground = 75 m 20 cm = 75.20 m

Breadth of playground = 34 m 80 cm = 34.80 m

Perimeter of playground = 2(l + b) = 2(75.20 + 34.80) = 220 m

Since the boy took 3 rounds, distance covered = 3 x 220 = 660 m

Speed of walking = 1.5 m per sec

Recall that speed = distance/ time

Therefore, time = 660/1.5 = 440 seconds or 7.33 minutes