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soumya1989

Director

Joined: 16 May 2014

Posts: 597

GRE 1: Q165 V161

Working alone at its constant rate, machine A produces k lit [#permalink]

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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pijusmadhu

Intern

Joined: 02 Aug 2018

Posts: 1

Re: Working alone at its constant rate, machine A produces k lit [#permalink]

08 Aug 2018, 06:46

6 min

NixonDutt

Intern

Joined: 10 Jun 2018

Posts: 32

Re: Working alone at its constant rate, machine A produces k lit [#permalink]

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.