# problem solving

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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.

• problem solving -

1 h/45 mi * 36 mi/1 g

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

• problem solving -

You wouldn't multiply that answer by 60 ?

36/45 is .8

• problem solving -

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.

• problem solving -

Okay got it. Thank you..

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