keeping in mind that, there are 5280 feet in 1 mile and 60 minutes in 1 hour.
[tex]\bf \cfrac{80~\underline{mile}}{\underline{hr}}\cdot \cfrac{5280~feet}{\underline{mile}}\cdot \cfrac{\underline{hr}}{60~min}\implies \cfrac{80\cdot 5280~feet}{60~min}\implies \cfrac{422400~feet}{60~min}
\\\\\\
7040\frac{feet}{min}[/tex]
