Question

The diameter of a cycle wheel is $28cm$. How many revolution will it make in moving $13.2km$?

• A. $12000$
• B. $14000$
• C. $15000$
• D. $18000$

Answer 1

The correct option is C $15000$

Distance travelled by the wheel in one revolution $=2\pi r=2\times \frac{22}{7}\times \frac{28}{2}=88cm$
and the total distance covered by the wheel
$=13.2\times 1000\times 100cm$
$=1320000cm$
$\therefore$ Number of revolutions made by the wheel
$=\frac{1320000}{88}$
$=15000$.