Math CentralQuandaries & Queries


Question from varoon, a student:

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


66 km per hour is

km per min

The car travels at this speed for 10 minutes and hence it travels 11 km.

The diameter of the wheel is 80 cm so its circumference measures 80 π cm. thus


So how many revolutions are there in 11 km?


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