we know that
[tex]1\ mile=5,280\ feet\\ 1\ hour=60\ min[/tex]
we have
[tex]40\frac{miles}{hour}[/tex]
Step [tex]1[/tex]
Convert [tex]\frac{miles}{hour}[/tex] to [tex]\frac{feet}{hour}[/tex]
[tex]40\frac{miles}{hour}=40*5,280=211,200\frac{feet}{hour}[/tex]
Step [tex]2[/tex]
Convert [tex]\frac{feet}{hour}[/tex] to [tex]\frac{feet}{min}[/tex]
[tex]211,200\frac{feet}{hour}=211,200/60=3,520\frac{feet}{min}[/tex]
therefore
the answer is
[tex]3,520\frac{feet}{min}[/tex]
