Frances can complete a job in 12 hours, and Joan can

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Frances can complete a job in 12 hours, and Joan can [#permalink]

17 Sep 2010, 02:56

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Question Stats:

83% (02:58) correct

16% (00:11) wrong

based on 37 sessions

Frances can complete a job in 12 hours, and Joan can complete the same job in 8 hours. Frances starts the job at 9 a.m., and stops working at 3 p.m. If Joan starts working at 4 p.m. to complete the job, at what time is the job finished?

A. 6 p.m.
B. 7 p.m.
C. 8 p.m.
D. 10 p.m.
E. 12 p.m.

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Re: Frances can complete a job in 12 hours [#permalink]

17 Sep 2010, 02:59

By 3pm, half the job is complete, since Frances has worked fro 6h and it takes him 12h to complete the whole thing
Joan starts at 4pm, he needs only 4h to do 50% of the work (since he needs 8h for the full thing). So it finishes by 8pm

Ans : (C)
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Re: Frances can complete a job in 12 hours [#permalink]

17 Sep 2010, 03:03

cano wrote:

I wish GMAT QUANT could have been such easy to have allowed me extra time to prepare for verbal !!!
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Re: Frances can complete a job in 12 hours [#permalink]

13 Mar 2012, 05:56

simple straight answer..
determine the induvidual rates (1/12 & 1/8 ) and calculate the corresponding hours.
it is four more hours from 4 pm so ans is 8 pm

hence C is the correct option
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Re: Frances can complete a job in 12 hours [#permalink] 13 Mar 2012, 05:56

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Frances can complete a job in 12 hours, and Joan can

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Frances can complete a job in 12 hours, and Joan can

Frances can complete a job in 12 hours, and Joan can

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