Explanation
To help understand the question we need an example.
A unit rate means a rate for one of something. We write this as a ratio with a denominator of one. For example, if you ran 70 yards in 10 seconds, you ran on average 7 yards in 1 second. Both of the ratios, 70 yards in 10 seconds and 7 yards in 1 second, are rates, but the 7 yards in 1 second is a unit rate.
Using the above idea we case say that;
The rate is
Answer
[tex]\frac{480}{12}=40\text{hours i}n\text{ 1 w}eek[/tex]Similarly, the unit rate will be
[tex]40\text{ hours in 1 w}eek[/tex]