Conversions:
Convert 60 miles per hour into feet per second.
V= (60 miles) There are 5280 feet in a mile.
(1 hour) There are 3600 seconds in an hour.
V= (60 miles) (5280 feet) (1 hour) Here is a properly set up conversion.
(1 hour) (1 mile) (3600 seconds)
V= (60 miles) (5280 feet) (1 hour) miles cancel or reduce to 1
(1 hour) (1 mile) (3600 seconds)
V= (60) (5280 feet) (1) hours cancel or reduce to 1
(1) (1) (3600 seconds)
V= (60) (5280 feet) (1) Reduce the 60 over 3600 to get 1 over 60
(1) (1) (3600 seconds)
(60)
V=   (5280 feet) (1) The ones are unneeded so eliminate them.
(1) (1) (60 seconds)
V=   (5280 feet) Divide 5280 by 60 to get answer
(60 seconds)
V= 88 feet = 88 feet per second
1 second