Each wheel of a car is of diameter 80cm. How many complete revolutions does each wheel make in 10min when the car is travelling at a speed of 66 km per hour.
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Correct option is C)
Given, speed of the car is 66km/hr Therefore, Distance travelled by the car in 1hr=66km/hr =>Distance travelled by the car in 10mins=6066×10km =11km=11×1000m =11×1000×100cm Diameter of car wheel=80cm Therefore, radius of car wheel=2diameter =280cm =40cm Therefore, Circumference of car wheel=2πr =2×722×40 =71760cm Therefore, Number of revolution made by the wheels in 10minutes=distance travelled by the car when its wheel completes one revolutiondistance covered by the car in 10 minutes