The Graph of a Function F Is Given $\mathrm { f } ^ { - 1 } ( 8 )$

Multiple Choice

The graph of a function f is given. Use the graph to find the indicated value.
-Let f(x) compute the time in hours to travel x miles at 60 miles per hour. What is the interpretation of $\mathrm { f } ^ { - 1 } ( 8 )$

A) The miles traveled in 8 hours at 60 miles per hour
B) The miles traveled in 60 hours
C) The hours taken to travel 8 miles at 60 miles per hour
D) The hours taken to travel 60 miles