SOLUTION: Hi. Sorry, I'm not sure if this is the right section to put this question. But I need help solving this problem: how many revolutions will a car wheel of diameter 30 in. make as

Question 237953: Hi. Sorry, I'm not sure if this is the right section to put this question. But I need help solving this problem:
how many revolutions will a car wheel of diameter 30 in. make as the car travels a distance of one mile?

Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
Hi. Sorry, I'm not sure if this is the right section to put this question. But I need help solving this problem:
how many revolutions will a car wheel of diameter 30 in. make as the car travels a distance of one mile?
------------------
= mile = 5280 ft = 63360 inches
The wheel's circumference is 30*pi inches, so it goes that far each revolution.
63360 in/(30*pi) in/rev = 2112/pi revolutions
= ~ 672.27 revolutions
----------------------
60 mph is 1 mile per minute, so the wheel would turn at 672 rpm at 60 mph.
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