Mathematics, 30.07.2019 17:30, didirose

Barry can do a certain job in 9 hours, whereas it takes samuel 11 hours to do the same job. how long would it take them to do the job working together? 20/99 incorrect: your answer is incorrect. hr

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Barry can do a certain job in 9 hours, whereas it takes samuel 11 hours to do the same job. how long...