shasadou wrote:
Ben is driving on the highway at x 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?
A. 5,280(x/y)
B. 5,280(y/x)
C. 5,280(xy)
D. 5,280/(xy)
E. (xy)/5,280
We are given that Ben is driving at an average rate of x mph and we need to determine how many revolutions each wheel turns in one hour.
Since 1 mile = 5,280 feet, Ben drives 5280x feet in one hour.
Thus, the number of revolutions is distance/circumference = (5,280x)/y = 5280(x/y).
Answer: A
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