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Math Help - Car Wheel Revolutions?

  1. #1
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    Car Wheel Revolutions?

    The question is: How many revolutions will a car wheel of diameter 30 in. make as the car travels a distance of one mile?


    I'm stumped on this one. I've tried plugging in what I have into a few different equations, but it doesn't seem like I have enough information to solve it. Thanks very much for the help.
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  2. #2
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    If the diameter is 30 inches then the circumference is

    C = 30\pi \approx 94.2477 inches.

    How many of these in a mile?
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  3. #3
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    ok 5280x12= 63360 inches in a mile. Then 63360 / 94.2477 = approx. 672.27 revolutions? Is that correct?
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    Looks good to me.
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