Question 714063
    One maid can clean the house three times faster than another. Working together they can clean the entire house in three hours. How long would it take the faster maid cleaning alone?
Let x = time (hours) it takes faster maid
then
3x = time (hours) it takes slower maid
.
3(1/x + 1/(3x)) = 1
3(3 + 1) = 3x
3(4) = 3x
4 hours = x