Question

The radius of a wheel is 0.25 m. How many revolutions will it make in covering 11 km ?

(a) 2800 (b) 4000 (c) 5500 (d) 7000

Answer 1

Radius $=0.25m$

Circumference $=2\pi r=2\times \frac{22}{7}\times 0.25m$

No:of revolutions $=\frac{\text{total distance}}{\text{circumference}}$

$=\frac{11000\times 7}{2\times 22\times 0.25}=7000$ revolutions