Question

A bicycle wheel makes 5000 revolutions in moving 11 km. Find the diameter of the wheel.

Answer 1

Let the radius of the wheel be r cm.

Distance covered by the wheel in one revolution = $\frac{11}{5000}$ $km$ = $220$ $cm$

$2\pi r=220$

$2\times \frac{22}{7}\times r=220$

$r=35$ $cm$

Diameter = $2r=70$ $cm$