Answer:
To calculate the unit rate in miles per gallon, you need to divide the distance traveled (in miles) by the amount of fuel used (in gallons).
The given fraction is:
15/4 divided by 1/5
To divide fractions, you multiply the first fraction by the reciprocal of the second fraction:
(15/4) * (5/1)
Simplifying the multiplication, we get:
75/4
Therefore, the unit rate in miles per gallon is 75/4.