To find out how long it will take Iris to complete the entire floor, we need to find the ratio between the amount of floor she completes and the time it takes.
We know that she completes 23 of the floor in 13 of an hour.
To find out how much floor she completes in 1 hour, we can set up a proportion:
23/13 = x/1
Cross multiplying, we get:
23 = 13x
Dividing both sides by 13, we find that:
x = 23/13
So, it would take her 23/13 hours, or approximately 1 hour and 46 minutes, to complete the entire floor.
Therefore, the correct answer is 112.