To find the total amount of time \( t \) that Nate's family spends at Mount Rushmore, you can use the relationship established in the problem statement. You know that the time spent watching the movie, which is \( \frac{1}{4} \) hour, represents \( \frac{1}{5} \) of the total time \( t \).
You can set up the equation as follows:
\[ \frac{1}{5}t = \frac{1}{4} \]
This equation states that one-fifth of the total time \( t \) is equal to one-fourth of an hour. You can solve this equation to find \( t \).