The distance from Philadelphia to Sea Isle is 100 mi. A car was driven this distance using tires with a radius of 14 in. How many revolutions of each tire occurred on the trip? (Hint: one revolution is equivalent to one circumference distance traveled. Thus, need to find how many ft is in 100 miles, and then need to find what the circumference of a 14 inch tire is)
Are you sure the radius is 14"? That sounds more like diameter, which would make the radius 7". Regardless, let me give you some help so you can figure out the answer.
Circumference = radius times 3.14 times 2
There are 5280 feet in a mile.
With this info, you should be able to solve the problem.