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
2/3hr
1 1/2
1hr
1/2hr
If Iris completes 2/3 of the floor in 1/3 of an hour, it means she covers 2/3 * 1 = 2/3 of the floor in 1 hour.
So, she can cover the entire floor in 1 hour. Therefore, it will take her 1 hour to sweep the gymnasium floor.