Question

Convert 50 mi/h to feet per minute.

Answer 1

Miles/Hour * Hours/Minute * Feet/Mile = Feet / Minute

Answer 2

That's called "dimensional analysis" - you multiply by conversion factors until everything cancels such that the original dimensions are gone and what you want remains

Answer 3

\[50 mi/h*5280ft/mi*(1/60)h/\min\]
so the miles and hours cancel and you are left with feet per minute