The unit rate for candy bars per one person is 1.67 bars per person.
The unit rate for people per candy bar is .6 people per candy bar.
You can find this by dividing by whichever you are looking for the 1 "thing" to be. So when we are looking for 1 person, we divide by the number of people.
5 candy bars/3 people = 1.67 candy bars per person.
Then we could do the same to find the other unit rate, simply in the other order.
3 people/5 candy bars = .6 people per candy bar.