Iris is asked to sweep the gymnasium for after a basketball game is requires her to push a sweeper from one end of the gym to the other repeating pattern until she’s covered the entire floor. She can please 2/3 of the four in 1/3 of an hour at this rate, how long will it take her to complete the entire floor?
(a) 1 1/2
(b) 1 hour
(c) 2/3 hours
(d) 1/2 hours
If Iris can cover 2/3 of the floor in 1/3 of an hour, then she can cover the entire floor in 1/3 * 3 = 1 hour.
Therefore, the answer is (b) 1 hour.