Question

find the diameter of a wheel that makes 490 revolution in going a distance of 4 kilometre 4m

Answer 1

Distance travelled in 1 revolution = 2 * 22/7 * R

Distance travelled in 1000 revolutions = 2 * 22/7 * R * 1000

1000 * 2 * 22/7 * R = 88000

R = 88000 * 7/1000 * 2 * 22= 14

radius of wheel = 14 m

and, diameter of wheel = 2 * R

= 2 * 14

= 28 m