Question

How much time will a boy take to
hun four rounds along the perimeter
of 18om long of 16om broad field it
his speeds is 8km 1h?
a) 20 min 105 sec b) 20 min 30 sec
c) 20 min 202sec d) 20
min 24 sec​

Answer 1

Answer:

answer d

Step-by-step explanation:

perimeter of field=2(l+b) = 2(180+160)=680m

he takes 4 rounds,so.....4(680)=2720m

speed=8km/1hour

=8000m/3600sec

=20/9 m/sec

formulae for the speed is, speed=distance/time

s = d/t

20/9 = 2720/t

t =2720×9/20

t=1224seconds

t=1200+24sec

=20(60sec)+24sec

=20minutes,24sec