Acar tire has a radius of 15 inches. suppose the car is traveling at 60 miles per hour (1 mile = 5,280 feet). what is the approximate rate of spin, in revolutions per minute, of the tire? round the answer to the nearest whole number.

First find the distance covered in 1 revolution,
Circumference  = 2π×15/12 = 7.85398 feet.              (1 foot=12 inches)

7.85398 feet = 7.85398/5280 = 0.001487496522 miles 

In 1 hour, it travels 60 miles. This means it travels (60/60) miles in 1 minute.

So, it travels 1 mile in 1 minute.

The rate of rotation = 1/0.001487496522
                               = 672.27rpm

To the nearest whole number = 672 rpm