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 = 2π*r*

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

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