# 4. 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 travelling at a speed of 66 km per hour?

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Circumference = 2πr

= 2*40*3.14

= 251.2 cm

Distance = Speed * Time

D = 18.3 * 10 * 60 = 10980 m

No. of revolutions = Distance/Circumference

= 10980/251.2

= 43.7

The Brainliest Answer!

Circumference of wheels = 2πr = 2r × π

= 80 π cm

Distance travelled by car in 10 minutes = (66 × 1000 × 100 × 10)/60 = 110000 cm/s

No. of revolutions = Distance travelled by car/Circumference of wheels

= 1100000/80 π = (1100000 × 7)/(80×22)

= 4375

4375 complete revolutions does each wheel make in 10 minutes.

Hope helped u dear frnd !!