Final answer:
The unit rate at which one gallon of paint covers a wall is 5/8 walls per gallon.
Step-by-step explanation:
To find the unit rate at which one gallon of paint covers a wall, we need to divide the amount of paint used to cover one wall (5/8 of a gallon) by the amount of wall covered. The unit rate can be found by dividing 5/8 by 1, which gives us 5/8.
Therefore, the unit rate at which one gallon of paint covers a wall is 5/8 walls per gallon.