The unit rate from the graph is given by the slope of the straight line graph
To find the slope, we need two pick any two points on the line, say
[tex]\begin{gathered} (t_{1,}d_1)\text{ and }(t_{2,}d_2) \\ \text{then} \\ \text{slope = }\frac{d_2-d_1}{t_2-t_1} \end{gathered}[/tex]We pick the points (0,0) and (4, 240)
[tex]\text{slope}=\frac{240-0}{4-0}=\frac{240}{4}=60[/tex]Therefore the unit rate from the graph is 60miles per hour
