Mathematics, 10.12.2020 02:30 fatty18

Answer fast By checking time records, a plumber finds that worker A can do a certain job in 12 hours. Worker B can do the same job in 9 hours. How many hours would the job take if the two plumbers worked together?

my options are 5 $\frac{1}{img src=$ 7}" /> and 6

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Answer fast By checking time records, a plumber finds that worker A can do a certain job in 12 hour...

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Answer fast By checking time records, a plumber finds that worker A can do a certain job in 12 hours. Worker B can do the same job in 9 hours. How many hours would the job take if the two plumbers worked together?my options are 5 7}" /> and 6

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Answer fast By checking time records, a plumber finds that worker A can do a certain job in 12 hours. Worker B can do the same job in 9 hours. How many hours would the job take if the two plumbers worked together?

my options are 5 $\frac{1}{img src=$ 7}" /> and 6