1 mile = 5280 feet

1 feet = 

1 hour = 60 minutes and 1 minutes = 60 seconds

1 hour = 60 × 60 seconds  (replace minutes with seconds)

1 hour = 3,600 seconds

1 second =

6 ft/sec changes to miles per hour

                     (replace seconds with )

                         (Divide:)

Replace feet’s with

=                        (Simplify)

Speed in mile/hr is .