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Work/Rate problem

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Work/Rate problem  [#permalink]

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New post 14 Mar 2017, 01:05
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13% (00:06) correct 88% (00:38) wrong based on 8 sessions

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A newer machine, working alone at its constant rate, can fill a production order in half the time required by two older machines working together at their constant rates. If the three machines are used together, will they require more than 1 hour to fill a production order?

(1) Each of the older machines, working alone at its constant rate, can fill half a production order in less than 4 hours.

(2) If the newer machine were to double its rate, it could fill a production order working alone in less than one hour

By statement 2 , if normally new machine would take less than 2 hours, so that means going with the question the old machines would take less than 4 hours to fill the production unit.

But this way it is contradicting statement 1,I read somewhere Statements dont contradict in DS. Also is statement 2 not sufficient to answer this

Please help

OA - E

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Re: Work/Rate problem  [#permalink]

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New post 16 Mar 2017, 06:39
KARISHMA315 wrote:
A newer machine, working alone at its constant rate, can fill a production order in half the time required by two older machines working together at their constant rates. If the three machines are used together, will they require more than 1 hour to fill a production order?

(1) Each of the older machines, working alone at its constant rate, can fill half a production order in less than 4 hours.

(2) If the newer machine were to double its rate, it could fill a production order working alone in less than one hour

By statement 2 , if normally new machine would take less than 2 hours, so that means going with the question the old machines would take less than 4 hours to fill the production unit.

But this way it is contradicting statement 1,I read somewhere Statements dont contradict in DS. Also is statement 2 not sufficient to answer this

Please help

OA - E


Discussed here: a-newer-machine-working-alone-at-its-constant-rate-162212.html

Please follow the rules when posting a question. Thank you.

--== Message from the GMAT Club Team ==--

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This discussion does not meet community quality standards. It has been retired.


If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.

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Re: Work/Rate problem &nbs [#permalink] 16 Mar 2017, 06:39
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