For this problem we know that a bus travels 2,160 miles in 36 hours. And we want to estimate the average distance that the bus travels in 1 hour. So we can set up the following proportion rule:
[tex]\frac{2160mi}{36hr}=\frac{x}{1hr}[/tex]Where x represent the variable of interest for this case. If we solve for x we got:
[tex]x=1hr\cdot\frac{2160mi}{36hr}=6mi[/tex]And then we can conclude that the answer would be 6 mi/hr or 6mi in 1 hour
