An instrument shows the number of revolutions per

minute made by each tire of a car. In each revolution, the

car travels a distance equal to the circumference of one of

its tires. The circumference of each tire is equal to 2πr,

where r is the radius of the tire.

If the radius of each tire on Maria’s car is 0.30 meter,

what is the approximate speed of Maria’s car, to the

nearest kilometer per hour, when the instrument is

showing 779 revolutions per minute?

(1 kilometer = 1000 meters)

minute made by each tire of a car. In each revolution, the

car travels a distance equal to the circumference of one of

its tires. The circumference of each tire is equal to 2πr,

where r is the radius of the tire.

If the radius of each tire on Maria’s car is 0.30 meter,

what is the approximate speed of Maria’s car, to the

nearest kilometer per hour, when the instrument is

showing 779 revolutions per minute?

(1 kilometer = 1000 meters)

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