Answer:
Ratio of flour to sugar as a fraction is

There is no unit rate.
Explanation:
Given : A recipe uses 3 cups of flour and 2 cups of sugar.
To find : Write the ratio of flour to sugar as a fraction, then find the unit rate?
Solution :
Number of cups of flour = 3
Number of cups of sugar = 2
The ratio of flour to sugar is 3 :2,
In a fraction, flour to sugar is

As both have same unit so it cancel outs.
There is no unit rate.