Question

Diameter of circular ground is 98 metre. If a student walks14 metre per minute at the edge of the ground then how much minute does he walk ?

Answer 1

The perimeter of the circular ground is $P=2\pi r=\pi d$, where $d$ is the diameter of the ground.

Substituting numerical values,

$P=\pi (98)=307.876\;m$.

The time taken to walk around the ground is

$t=\frac{307.876}{v }\\ t=\frac{307.876}{14 }\\ t=21.99\;minutes$