SOLUTION: If barbara were to paint her living room alone, it would take 4 hours . Her sister sarah could do the job in 5 hours . How long would it take them working together ? If needed Redu

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Question 1134199: If barbara were to paint her living room alone, it would take 4 hours . Her sister sarah could do the job in 5 hours . How long would it take them working together ? If needed Reduce to lowest terms
Found 3 solutions by MathLover1, MathTherapy, greenestamps:
Answer by MathLover1(20849) About Me  (Show Source):
You can put this solution on YOUR website!
1%2F3%2B1%2F5=1%2Fx
%285%2B3%29%2F%283%2A5%29=1%2Fx
8%2F15=1%2Fx...... cross multiply
8X=15
x=15%2F8
x=1.875 hours or x=1h53min working together

Answer by MathTherapy(10551) About Me  (Show Source):
You can put this solution on YOUR website!

If barbara were to paint her living room alone, it would take 4 hours . Her sister sarah could do the job in 5 hours . How long would it take them working together ? If needed Reduce to lowest terms
Correct answer: highlight_green%28matrix%281%2C4%2C+20%2F9%2C+or%2C+2%262%2F9%2C+hours%29%29

Answer by greenestamps(13198) About Me  (Show Source):
You can put this solution on YOUR website!


The method shown by tutor @MathLover1 is correct; but she used the wrong numbers.

Using the right numbers with her method gives the correct answer as shown by tutor @MathTherapy.