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Working alone, Hongyi can do a certain job in three hours and Yuming can do the same job in two hours. At these rates, how long would it take Hongyi and Yuming to do this job working together?

 Mar 1, 2020
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Hongyi and Yujming can do the job together in (3 + 2)/2 = 2.5 hours.

 Mar 1, 2020

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