Question

Diameter of a wheel is $3m$ The wheel revolves $28$ times in a minute To cover the distance of $5.280$ km the wheel will take $(\pi =\frac{22}{7})$

• A. $10$ minutes
• B. $20$ minutes
• C. $30$ minutes
• D. $40$ minutes

Answer 1

The correct option is B $20$ minutes

Perimeter of the wheel $=2\pi r=2\times \frac{22}{7}\times 1.5m$
$=\frac{66}{7}m$

Wheel covers a distance of $\frac{66}{7}\times 28=264m$ in one minute

$\therefore$ it covers a distance of 5280 m in$=\frac{5280}{264}=20$ Minutes