Mathematics, 20.07.2019 11:00 CauseWhyNot6235
Jack and fred have to do a certain job. if jack works alone he can finish the job in 3 hours. if fred works alone he can finish the job in y hours. the two of them can finish the job in 2 hours if they work together. what is the value of y?
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Jack and fred have to do a certain job. if jack works alone he can finish the job in 3 hours. if fre...
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