Question

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

Options

• 2800

• 4000

• 5500

•  7000

Answer 1

7000
Distance covered in 1 revolution = 2πr

`=(2xx22/7xx0.25)"m"`

`=(2xx22/7xx25/100)"m"`

`= 11/7 "m"`

Number of revolutions taken to cover 11 km`=(11xx1000xx7/11)`

= 7000