Question

Unless stated otherwise, use π = 22/7. 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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Answer 1

Answer:

Circumference of wheel= (22/7*80/100 )m , which is distance covered in one Revolution. No. of complete Revolution = 11000/(22/7*80/100 ) = 4,375.

Answer 2

Answer:

Given

Diameter of wheel (D)=80 cm

Radius (r)= 80/2 =40 cm.

1 complete revolution of wheel = Circumference of wheel (C)

C=2πr=2π×40=80π cm

C=0.8π m

Speed of the car =66 km / hr.= 66× 1000/ 60 m/min

∴ Speed of the car =1100 m / min.

Therefore, in 10min., the car will travel a distance of 1100×10=11000 m

No. of revolutions of wheel = 11000/0.8π = 11000×7 / 0.8 × 22 =4375

Each wheel of the car makes 4375 complete revolutions in 10 min.

Step-by-step explanation:

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