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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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Re: Working alone at its constant rate, machine A produces k lit [#permalink] New post 08 Aug 2018, 06:46
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Re: Working alone at its constant rate, machine A produces k lit [#permalink] New post 10 Aug 2018, 15:49
For Machine A, in 1 minute it produces K/10 litres.
For Machine B, in 1 minute it produces K/15 litres.
Together in 1 minute they produce k/10 + k/15 litres = k/6 litres
So, K/6 litres are produced in 1 minute.
K litres are produced in 6 minutes.
Ans - 6 minutes.
Re: Working alone at its constant rate, machine A produces k lit   [#permalink] 10 Aug 2018, 15:49
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Working alone at its constant rate, machine A produces k lit

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