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Working alone at its constant rate, machine A produces k lit

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Working alone at its constant rate, machine A produces k lit [#permalink] New post 29 May 2014, 04:37
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Working alone at its constant rate, machine A produces k liters of a chemical in 10 minutes. Working alone at its constant rate, machine B produces k liters of the chemical in 15 minutes. How many minutes does it take machines A and B, working simultaneously at their respective constant rates, to produce k liters of the chemical?

___________ minutes
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Working alone at its constant rate, machine A produces k lit   [#permalink] 29 May 2014, 04:37
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