Ben is driving on the highway at y miles per hour. (One mile equals 5,280 feet.) Ben's tires have a circumference of z feet. Which of the following expressions gives the number of revolutions each wheel turns in one hour? Choose the most appropriate option
A) 5,280(x/y)
B) 5,280(y/z)
C) 5,280(xy)
D) 5,280/(xy)
E) (xy)/5,280
In one hour, at the rate of y miles per hour, Ben covers y miles, so 5,280y feet.   The number of revolutions = distance/circumference = 5,280y/z.   Answer: 5,280(y/z).
<result>B</result>
Ben is driving on the highway at y miles per hour. (One mile equals 5,280 feet.) Ben's tires have a circumference of z feet. Which of the following expressions gives the number of revolutions each wheel turns in one hour?