Miles per hour to feet per second

Question

A parachutist’s rate during a free fall reaches 144 miles per hour. What is this rate in feet per second?

Answer 1

 

We can just write out the conversions, by placing the units properly you can ensure you're doing it correctly as the old units will all cancel, as follows:

 

144mi/hr * 1hr/3600s * 5280ft/mi  =  211.2ft/s