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31 December, 06:01

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?

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  1. 31 December, 09:58
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    it would take 2 hours because of the average of 3 plus 2 plus 1 divided by 3
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