Question

Each wheel of a car is of diameter 80cm. How many complete revolutions does each will make in 10 minutes when the car is travelling at a speed of 66 km per hour?

Answer 1

r=40cm=0.40m
66km/h
in 10 min=10/60h=. =66×1/6=11km=11000m

2πr= 2× 3.14 × 0.40 m

no. of revolun= 11000/2×3.14×0.40 = your answer