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Mathematics
OpenStudy (anonymous):

One person can do a certain 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? 6 min 12 min 24 min

OpenStudy (anonymous):

C1=J/21min C2=J/28min t(C1+C2)=J-> ->t=(1/(1/28+1/21))->t=12min

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