Mathematics, 04.03.2020 18:06 amc2412

Joe and Eric have to ship 75 packages. Joe can do the job alone in 5 hours. if Eric helps, they get it done in 4 hours. How long would it take Eric to do the job alone?

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Joe and Eric have to ship 75 packages. Joe can do the job alone in 5 hours. if Eric helps, they get...