Answer choice 3 (6 2/3miles) is the best one in this case.
Based on the trend of the graph, it increases at a rate of about 2 miles per 18 minutes.
Proportionally, to find the best result for 60 minutes, an equation could be set up as:
Then using cross multiplication, the result would be:
Next divide both sides by 18 to find the solution for x (the approximate number of miles):