Transform the 45 minutes into hours, as shown below
[tex]\frac{45}{60}=\frac{3}{4}=0.75[/tex]Then 45 minutes is equal to 0.75 hours.
Divide the number of miles by the number of hours,
[tex]\frac{59miles}{0.75hours}=78.666...\frac{miles}{hours}[/tex]Rounding to the nearest tenth,
[tex]\Rightarrow\frac{59}{0.75}\approx78.7[/tex]The answer is 78.7 miles per hour, approximately.
