Question

the length and breadth of a playground are 80 meter and 35metre respectively.
(i) how long will a boy take to go three times round the field, if he walks at rate of 1.5metre per second.

Answer 1

Answer:

l=80 m

b=35 m

perimeter of rectangle=2x(l+b)

=2x(80+35)

=2x115

=230

distance covered by the boy =3 times the perimeter

=3x230

=690

speed=1.5m/s

speed=distance/time

1.5m/s=690/t

t=690x10/1.5x10          (to remove the decimal from the denominator we multiply by 10)

t=6900/15

=460

therefore time taken by boy is 460 secs

Step-by-step explanation: