Question

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?

Answer 1

Diameter of the wheel of the car = 80 cm

Radius (r) of the wheel of the car = 40 cm

Distance travelled in 1 revolution = Circumference of wheel

Circumference of wheel

= 2πr = 2π 40 = 80π cm ( )

Speed of car = 66 km/hour

66 100000 cm/ m

= 110000 c in 6 in 0 m/m

Distance travelled by the car in 10 minutes  

Therefore, each wheel of the car will make 4375 revolutions.

4375