Average speed =

Substitute distance = 500 feet and time = 60 seconds

Average speed =                             

1 hour = 60 minutes

1 minute = 60 Seconds

So, 1 hour = 60 × 60 Seconds

1 hour = 3600 seconds

 Average speed =

 Average speed =      

  Average speed =           (Cancel out common unit seconds)

Average speed=     

  Average speed=      

Simplify

Average speed=

Replace feet’s with

=

Simply

=

The average speed is 5.682 miles per hour