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# Working alone at its constant rate, machine K took 3 hours

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Joined: 05 Nov 2008
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Working alone at its constant rate, machine K took 3 hours [#permalink]

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06 Nov 2008, 09:41
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Working alone at its constant rate, machine K took 3 hours to produce of the units produced last Friday. Then machine M started working and the two machines, working simultaneously at their respective constant rates, took 6 hours to produce the rest of the units produced last Friday. How many hours would it have taken machine M, working alone at its constant rate, to produce all of the units produced last Friday?

A. 8
B. 12
C. 16
D. 24
E. 30
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Joined: 14 Sep 2003
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06 Nov 2008, 10:54
question looks incomplete..

is it missing a fraction right after produce and of below

machine K took 3 hours to produce of the units produced last Friday
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Re: Friday----30   [#permalink] 06 Nov 2008, 10:54
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