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