Observe the graph :

The line increases at a positive slope.

This represents the track team running or walking at a steady pace.

Next, the slope is zero. This indicates that the team stops for a short period of time.

Then, the line increases at a positive slope, about the same pace as the beginning of the run.

This represents the track team running or walking at a steady pace.

Finally, the line increases at a positive slope, but at a rate less than the and part sof the run.

This indicates that the team runs or walks at a steady pace, but at a slower pace.