Answer
$\frac{1}{x}$
Work Step by Step
Note that:
If it takes the painter 2 hours to paint the wall, then the painter is able to paint $\frac{1}{2}$ of the wall for each hour.
If it takes the painter 4 hours to paint the wall, then the painter can paint $\frac{1}{4}$ of the wall for each hour.
This means that the hourly rate can be found by dividing 1 by the number of hours it takes the painter to paint the wall.
Thus, if the painter needs $x$ hours to paint the wall, then he can paint $\frac{1}{x}$ of the wall for each hour.
