Question

The diameter of the wheel of a car is $77cm$. How many revolution will it take to travel $121m$

Answer 1

Let the number of revolution be x

$x\ast$ circumference of wheel = Area Covered

$x\ast 2\pi r=121m$

$x\ast 2\times \frac{22}{7}\times \frac{77}{2}=12100cm$

$x\ast \frac{44\times 77}{14}=12100cm$

$x\ast \frac{3388}{14}=12100$

$x=\frac{12100}{242}=50$

Hence the wheel of car takes 50 revolutions.