problem solving
posted by ben on .
Suppose your car gets 36 miles per gallon of gasoline, and you are driving 45 miles per hour. Using unit analysis, find the number of hours it takes to use 1 gallon of gas.
I got 48 minutes but I'm not sure.

1 h/45 mi * 36 mi/1 g
mi cancels and you are left with 36/45 hours/gallon 
You wouldn't multiply that answer by 60 ?
36/45 is .8 
It is in hours and it asks for hours.
If you wanted minutes you would multiply by 60 min/h to cancel the h and get min/gal but it did not ask for that. 
Okay got it. Thank you..