Mathematics, 03.12.2019 00:31 azireyathurmond1

Working alone at its constant rate, machine a produces x boxes in 10 minutes and working alone at its constant rate, machine b produces 2x boxes in 5 minutes. how many minutes does it take machines a and b, working simultaneously at their respective constant rates, to produce 3x boxes?

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Working alone at its constant rate, machine a produces x boxes in 10 minutes and working alone at it...