Hello There!
First we have to see how much does Gigi earns per hour.
For gardening, we are going to divide.
65 ÷ 5 ≈ 13
Gigi earns $13 for gardening for only 1 hour.
Second, we have to see how much Gigi earns per hour for office work.
We will divide
90 ÷ 9 ≈ 10
Now, we can see that Gigi earned $3 more per hour for gardening than for office work.