To complete 2/3 of the floor in 1/3 of an hour, Iris completes 2/3 / 1/3 = <<2/3/1/3=2>>2 floors per hour.
Therefore, it will take her 1/2 an hour to complete 1 floor.
Thus, it will take her 1/2 * 3 = 3/2 hour to complete 3 floors. Answer: \boxed{\frac{3}{2}}.
Iris is asked to sweep the gymnasium floor after a basketball game. This requires her to push a sweeper from one end of the gym to the other and repeating the pattern until she has covered the entire floor. She completes 2/3 of the floor in 1/3 of an hour. At this rate, how long will it take her to complete the entire floor?
1 answer