Question

How long will a man take to make a round of a circular field of radius 21m cycling at the speed of 8km per hour

Answer 1

Circumference = 2*pi*r = 2*22/7*21 = 132m

So, distance = 132m= 132/1000= 0.132 km
Speed = 8km/h

Time = Distance /speed = 0.132/8 = 0.0165 hrs

And, 0.0165 hrs = 0.0165*3600= 59.4 seconds

Answer 2

[tex]Radius of circle =20m Speed = 8 km/h =8*(1000/3600) = 2.222 m/s perimeter of circle = 2 \pi r = 2 * (22/7) * 21 = 132 m so Time taken = Distance /speed Time taken =132/2.222 Tme taken = 59.406Second[/tex]