When the graph rises one square for a run of one square, the slope is 2 km/(0.5 h) = 4 km/h. When the graph rises half that fast, the slope is 2 km/h. When the graph is horizontal, the slope is 0. The slope of the distance vs time curve is the speed.
- S = 4 km/h, when 0 < t < 2 h
- S = 0, when 2 h ≤ t < 2.5 h
- S = 4 km/h, when 2.5 h ≤ t < 3 h
- S = 0, when 3h ≤ t < 4 h
- S = 2 km/h, when 4 h ≤ t < 5 h
