Answer: 17 miles per hour.
Step-by-step explanation:
1. To solve this problem you must apply the following formula:
[tex]S[/tex]=Δx/Δt
Where Δx is the position variation and Δt is the time variation.
2. Then, based on the graph shown attached, you have:
[tex]S=\frac{20mi+20mi+30mi+15mi}{1h+1h+1h+2h}[/tex]
3. Therefore, you have that the result is:
[tex]S=17mi/h[/tex]
