SOLUTION: I am doing a rational expression application work problm for my class and I want to make sure that I do the problem correctly. My Work problm is: It takes 7 hours for will to

Question 586412: I am doing a rational expression application work problm for my class and I want to make sure that I do the problem correctly.
My Work problm is:
It takes 7 hours for will to paint a house. Judy can paint the same house in 3 hours. How long will it take them to paint the house if they work together?
Would I start my rational expression as 1/7x + 1/3x?
thank you,
mm
Found 2 solutions by scott8148, Earlsdon:
Answer by scott8148(6628) (Show Source): You can put this solution on YOUR website!
= 1
Answer by Earlsdon(6294) (Show Source): You can put this solution on YOUR website!
Not quite!
Simplify.
Multiply both sides by 21.
Divide by 10.

It would take them 2.1 hours or 2 hours and 6 minutes.
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