Let F(x) Compute the Time in Hours to Travel X $\mathrm { f } ^ { - 1 } ( 7 )$

Multiple Choice

Let f(x) compute the time in hours to travel x miles at 29 miles per hour. What is the interpretation of $\mathrm { f } ^ { - 1 } ( 7 )$

A) The hours taken to travel 29 miles
B) The miles traveled in 29 hours
C) The miles traveled in 7 hours at 29 miles per hour
D) The hours taken to travel 7 miles at 29 miles per hour