Choose the One Alternative That Best Completes the Statement or Answers

Multiple Choice

Choose the one alternative that best completes the statement or answers the question.
Solve the problem.
-Let $\mathrm { f } ( \mathrm { x } )$ compute the time in hours to travel $x$ miles at 32 miles per hour. What does $\mathrm { f } ^ { - 1 } ( \mathrm { x } )$ compute?

A) The miles traveled in 32 hours
B) The hours taken to travel 32 miles
C) The miles traveled in $x$ hours
D) The hours taken to travel x miles