Angie can peel
1
6
of a crate of potatoes every
1
18
of a hour. compute the unit rate by setting up a complex fraction and simplifying.

Given:
1/6 of a crate of potatoes every 
1/18 of an hour

We get the unit rate by dividing the ratio of the crate by the ratio of the hour.

1/6 ÷ 1/18 ⇒ 1/6 * 18/1 = 18/6 = 3 per hour 

The unit rate is 3 per hour.

Hold on lemme do the work