
Quang T. answered 08/13/19
GIS Professional with experience in Python and Data Engineering
You know the rate of change is (3 miles)/(30 min). Multiply 36 miles and [(30 min)/( 3miles)]. You are eliminating the unit of distance (miles) so you can get the unit of time (minutes). Dividing miles by miles will eliminate it.
The answer is 360 minutes or 6 hours