Eli left his house one afternoon to study at the library. The graph shows his distance, in miles, away from his house as a function of time, in minutes. A graph titled Eli's Trip to the Library. The horizontal axis shows Time (minutes), numbered 0 to 135, and the vertical axis shows Distance from Home (miles) numbered 0 to 5. The line begins at 0, goes up to 4 miles from 30 to 120 minutes, then goes down to 0 miles in 133 minutes.
What could explain what happened when the time was equal to 120 minutes?