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Working together, Joe and Joanne finish a job in 2 hours. How long wil

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Working together, Joe and Joanne finish a job in 2 hours. How long wil  [#permalink]

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New post 01 Aug 2017, 13:11
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A
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E

Difficulty:

  5% (low)

Question Stats:

84% (01:18) correct 16% (01:20) wrong based on 167 sessions

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Working together, Joe and Joanne finish a job in 2 hours. How long will it take Jeremy and Joe to finish the job?

(1) Working alone and without breaks Joe takes 5 hours to finish the job, which is 400% as long as the time it takes Jeremy to finish the job.

(2) Working alone and without breaks Joanne takes 10 hours to finish 3 times the job.

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Re: Working together, Joe and Joanne finish a job in 2 hours. How long wil  [#permalink]

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New post 01 Aug 2017, 19:59
The answer is A.

Quote:
(1) Working alone and without breaks Joe takes 5 hours to finish the job, which is 400% as long as the time it takes Jeremy to finish the job.


This straightway gives the time that is taken by Joe and Jeremy's time can be easily calculated. Sufficient.

Quote:
(2) Working alone and without breaks Joanne takes 10 hours to finish 3 times the job.

Here, we can calculate the time taken by Joanne and Joe. However, without statement 1 we can't arrive at the time taken by jeremy. Hence not sufficient.
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Re: Working together, Joe and Joanne finish a job in 2 hours. How long wil  [#permalink]

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New post 01 Aug 2017, 20:07
Bunuel wrote:
Working together, Joe and Joanne finish a job in 2 hours. How long will it take Jeremy and Joe to finish the job?

(1) Working alone and without breaks Joe takes 5 hours to finish the job, which is 400% as long as the time it takes Jeremy to finish the job.

(2) Working alone and without breaks Joanne takes 10 hours to finish 3 times the job.


1) Joe's time is 5 hrs, hence Jeremy's time is 1.25 hrs. Combined time is 6.25 hrs. Sufficient.

2) Insufficient - from here I can figure out Joe's time but it does not give me any information about Jeremy's.

Answer choice A.
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Re: Working together, Joe and Joanne finish a job in 2 hours. How long wil  [#permalink]

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New post 05 Aug 2017, 06:28
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azelastine wrote:
Bunuel wrote:
Working together, Joe and Joanne finish a job in 2 hours. How long will it take Jeremy and Joe to finish the job?

(1) Working alone and without breaks Joe takes 5 hours to finish the job, which is 400% as long as the time it takes Jeremy to finish the job.

(2) Working alone and without breaks Joanne takes 10 hours to finish 3 times the job.


1) Joe's time is 5 hrs, hence Jeremy's time is 1.25 hrs. Combined time is 6.25 hrs. Sufficient.

2) Insufficient - from here I can figure out Joe's time but it does not give me any information about Jeremy's.

Answer choice A.


"" A is sufficient , but the answer is not 6.25 hours, if both worked together - the answer is 0.7 hours.
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Re: Working together, Joe and Joanne finish a job in 2 hours. How long wil  [#permalink]

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New post 08 Aug 2017, 13:15
Ruchita1907 wrote:
azelastine wrote:
Bunuel wrote:
Working together, Joe and Joanne finish a job in 2 hours. How long will it take Jeremy and Joe to finish the job?

(1) Working alone and without breaks Joe takes 5 hours to finish the job, which is 400% as long as the time it takes Jeremy to finish the job.

(2) Working alone and without breaks Joanne takes 10 hours to finish 3 times the job.


1) Joe's time is 5 hrs, hence Jeremy's time is 1.25 hrs. Combined time is 6.25 hrs. Sufficient.

2) Insufficient - from here I can figure out Joe's time but it does not give me any information about Jeremy's.

Answer choice A.


"" A is sufficient , but the answer is not 6.25 hours, if both worked together - the answer is 0.7 hours.


Right.

I just added the hours whereas the right way to do it (if I were actually solving this) would be to figure out the rate (29/20) and then reverse it, correct?
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Re: Working together, Joe and Joanne finish a job in 2 hours. How long wil  [#permalink]

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Re: Working together, Joe and Joanne finish a job in 2 hours. How long wil   [#permalink] 23 Oct 2018, 20:38
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