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

Explanation

Distance travelled by the wheel in one revolution `= 2 pi r = (22)/(7) xx 28 = 88 cm`
Total distance travelled by the wheel `= 13.2 xx 1000 xx 100 cm`
Number, of revolutions made by the wheel `= ("Total distance")/("circumference")`
`= (13.2 xx 1000 xx 100)/(88) = 15000` revolutions