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If Joe and Sam can complete a job in 2 hours working together, what fr

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If Joe and Sam can complete a job in 2 hours working together, what fr  [#permalink]

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New post 19 Dec 2018, 12:03
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A
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D
E

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Question Stats:

84% (00:51) correct 16% (01:41) wrong based on 58 sessions

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If Joe and Sam can complete a job in 2 hours working together, what fraction of the job was done by Joe?

(1) If Joe had worked alone, he would have completed the job in 3 hours.

(2) Sam did one-third of the job.

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Re: If Joe and Sam can complete a job in 2 hours working together, what fr  [#permalink]

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New post 19 Dec 2018, 20:50
SajjadAhmad wrote:
If Joe and Sam can complete a job in 2 hours working together, what fraction of the job was done by Joe?

(1) If Joe had worked alone, he would have completed the job in 3 hours.

(2) Sam did one-third of the job.



Statement 1: Working alone, Joe can complete the job in 3 hours. Together, they complete in 2 hours. The fraction of job done by Joe= Efficiency of Joe/ Total efficiency required by both= (1/3)/(1/2)=2/3. Sufficient.

Statement 2: Sam did 1/3 of the job. The fraction of job done by Joe=1-1/3=2/3. Sufficient.


IMO, Option D.
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Re: If Joe and Sam can complete a job in 2 hours working together, what fr   [#permalink] 19 Dec 2018, 20:50
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