# problem solving

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.

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1. 1 h/45 mi * 36 mi/1 g

mi cancels and you are left with 36/45 hours/gallon

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2. You wouldn't multiply that answer by 60 ?

36/45 is .8

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3. 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.

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4. Okay got it. Thank you..

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