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25 November, 12:15

Jill's car tires are spinning at a rate of 120 revolutions per minute. If her car tires' radii are each 14 inches, how far does she travel in 5 minutes.

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  1. 25 November, 12:26
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    FInd the circumference of the tire:

    C = 2 x PI x r

    C = 2 x 3.14 x 14

    C = 87.92 inches.

    For every revolution of the tire it travels 87.92 inches.

    In one minutes the car travels 87.92 x 120 = 10,550.4 inches.

    In 5 minutes the car travels 10550.4 x 5 = 52,752 inches.

    52,752 / 12 = 4,396 feet

    1 mile = 5280 feet

    4396 / 5280 = 0.833 miles

    I calculated 3 different measurements. Use the one needed.
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