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OpenStudy (anonymous):

one person can do a job in twenty-one minutes,and another person can do the same job in twenty-eight minutes. How many minutes will it take them to do the job together? please answer!?

OpenStudy (anonymous):

please answer really need help

hartnn (hartnn):

one person can do a job in twenty-one minutes means he will do 1/28 th of the work in one minute (unit time). got this ?

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