Question

A wheel of a car of radius 21 cms is rotating at 600 rpm. What is the speed of the car in km/hr?

Answer 1

Explanation:

Given,

r=21cm

So, distance covered in one rotation is 2πr

= 2*3.14*21

= 131.88cm

Rpm =600

So

Distance covered in a minute

= 600*131.88

= 791.28m/min

Convert this to kmph

=(791.28/1000)/(1/60)

=47.5 kmph