Question

Diameter of circular ground is $98$ metre. If a student walks $14$ metre per minute at the edge of the ground then how much minute does he walk?

Answer 1

Diameter of circular ground $\left(d\right)=98m$

$\Rightarrow$ Radius of circular ground $\left(r\right)=\frac{d}{2}=\frac{98}{2}=49m$

Now, Circumference of circular ground $=2\pi r=2\times \frac{22}{7}\times 49=308m$

It is given that a student walk at $14mpermin$ around the edge.

So, Time taken to complete to walk around the edge $=\frac{\text{Circumference of circular ground}}{\text{Speed}}=\frac{308}{14}=22min$