Question

A roller has a diameter of 14 m, then find the number of revolutions it makes while travelling 616 m.

Answer 1

Since the diameter of the roller is $14m$, its radius is $7m$.

In one revolution, the wheel covers the distance of one circumference.
Circumference of the roller of radius
$7m=2\times \frac{22}{7}\times 7=44m$
To travel, $616m$, number of revolutions it makes $=\frac{\text{Total distance travelled}}{\text{Distance travelled in one revolution}}$

$=\frac{616}{44}=14m$