Question

The radius of the wheel of a bus is 35 cm. How many rotations will a wheel complete while travelling a distance of 11 km.

Answer 1

$1$ rotation$=2\pi r$

$=2\times \frac{22}{7}\times 35$cm

$=220$cm

No. of rotations completed while travelling $11$ km is $\frac{11km}{220cm}=\frac{11,000m}{220cm}=\frac{11000m}{2.2m}$

$=\frac{110000}{22}=\frac{10000}{2}$

$=5000$

So while travelling $11$km, $5000$ rotations will be completed.