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As we can see, the robot walks at a constant speed, because the distance is the same for a the same time inverval. Also, we can see it because it is a linear graph.
To get the speed we can find the slope of the graph, which can be done by dividing an interval of the distance by the corresponding intervale of time. Let's pick (0,0) to (1,20). The speed (or slope) is:
[tex]s=\frac{20-0}{1-0}=\frac{20}{1}=20[/tex]So, the sp