The wheels of a car are of diameter 80 cm each. How many complete revolutions does each wheel make in 10 minutes when the car is traveling at a speed of 66 km per hour?
please write in a simple method?
Given: speed of the car = 66 km/h
∴ Distance travelled by the car in 1 hour or 60 minutes = 66 km/h
⇒ Distance travelled by the car in 10 minutes =
= 11 km = 11 × 1000 m
= 11 × 1000 × 100 cm
Diameter of car wheel = 80 cm
∴ radius of car wheel =
∴ Circumference of the wheel = 2πr
we know that, circumference of the wheel = Distance travelled by the car when its wheels take one complete revolution
∴ Number of revolutions made by wheels in 10 minutes
= 4375 revolutions