Question

The legth and the breadth of a playground are 80 m and 35 m respectively (i) find the cost of leveling it at ₹4.50 per square metre (i)how long will a boy take to go three times round the field , if he walks at rate of 1. 5 m per second ?

Answer 1

Length of playground 80m
breadth of playground 35m
Area of playground length× breadth
80×35= 2800msq
cost levelling= 4.50×2800
12600rs
Thus cost of levelling is 12600 rupees

perimeter of ground = 2 ( length +breadth)
2 (80+35)
=150 m is perimeter of ground
a boy run three times 150×3 = 450
time taken distance per second= 1.5m
450× 1.5= 675seconds
Thus he will complete in 675 seconds