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Based on the given information, Iris is able to complete 2/3 of the floor in 1/3 of an hour. To find out how long it will take for her to complete the entire floor, we can set up a proportion.
Let x represent the time it takes for her to complete the entire floor. The proportion can be set up as follows:
(2/3)/(1/3) = 1/x
To solve this proportion, we can multiply both sides by x to eliminate the fraction.
2/3 * x = 1/3
Next, we can solve for x by dividing both sides by 2/3.
x = (1/3)/(2/3)
x = 1/3 * 3/2
x = 1/2
Therefore, it will take Iris 1/2 of an hour or 30 minutes to complete the entire floor.