# Car Wheel Revolutions?

• Aug 29th 2010, 12:29 PM
coolguy67
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. (Headbang) Thanks very much for the help.
• Aug 29th 2010, 12:58 PM
Prove It
If the diameter is 30 inches then the circumference is

$C = 30\pi \approx 94.2477$ inches.

How many of these in a mile?
• Aug 29th 2010, 01:06 PM
coolguy67
ok 5280x12= 63360 inches in a mile. Then 63360 / 94.2477 = approx. 672.27 revolutions? Is that correct?
• Aug 29th 2010, 01:19 PM
Prove It
Looks good to me.