Question

Radius of a wheel is 0.25 m. How many rounds will it take to complete the distance of 11 km?

Answer 1

Distance to be completed = 11 km = 11000 m Distance covered in one round = $2\pi r=2\times \pi \times 0.25m=0.50\pi m$
$\therefore$ Number of rounds required to cover 11 km = $\frac{Totaldistancecovered}{Distancecoveredinoneround}$ = $\frac{11000m}{0.50\pi m}=\frac{11000\times 7}{0.50\times 22}=7000.$