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. What could explain what happened when the time was equal to 120 minutes?

Unfortunately, there is no given graph. If the graph if distance on the y-axis and time on the x-axis, this means that the slope is the velocity. At a specific time t, the velocity is called instantaneous velocity while at a time interval t = a to t = b, it is the average velocity.