SOLUTION: worker A can do a certain job in 12 hours.Worker B can do the same job in 9 hours.How long would it take if they worked together?
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Question 259415: worker A can do a certain job in 12 hours.Worker B can do the same job in 9 hours.How long would it take if they worked together?
Answer by scott8148(6628) (Show Source): You can put this solution on YOUR website!
(x / 12) + (x / 9) = 1
3x + 4x = 36
x = 36/7 (a bit over 5 hours)
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