Answer:
26 2/3
Step-by-step explanation:
The easiest way to find the answer is to look at the graph value for 1 hour. It is slightly more than 25, but the graph isn't detailed enough to let us read a precise value.
The next best way is to find a grid intersection that the line goes through. We observe that (1.5 hours, 40 miles) is on the plotted line, so the proportion is ...
(40 mi)/(1.5 h) = 26 2/3 mi/h
