SOLUTION: Sara can clean an attic in 9 hours. Floyd cleans the same attic in 15 hours How fast can they clean the attic if they work together? What equation do you use to get the answer?

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Question 483649: Sara can clean an attic in 9 hours.
Floyd cleans the same attic in 15 hours
How fast can they clean the attic if they work together?
What equation do you use to get the answer?
Answer by Tatiana_Stebko(1539) About Me  (Show Source):
You can put this solution on YOUR website!
Let they will work together x hours
In 1 hour Sarah can do 1%2F9 part of job, in x hours she will do x%2F9part of job
In 1 hour Floyd can do 1%2F15 part of job, in x hours he will do x%2F15 part of job
Together in x hours they will finish all job
The equation
x%2F9%2Bx%2F15=1 multiply by 45
5x%2B3x=45
8x=45
x=45%2F8=55%2F8
in 55%2F8 hours they will clean an attic together