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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 [#permalink] New post 17 Sep 2010, 01:56
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C
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Question Stats:

80% (02:35) correct 20% (00:42) wrong based on 79 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] New post 17 Sep 2010, 01:59
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] New post 17 Sep 2010, 02:03
cano wrote:
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] New post 13 Mar 2012, 04:56
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, 04:56
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Frances can complete a job in 12 hours, and Joan can

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