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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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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.
[Reveal] Spoiler: OA

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Kudos [?]: 135331 [0], given: 12687

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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.

Kudos [?]: 0 [0], given: 3

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Joined: 10 Nov 2013
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Kudos [?]: 4 [0], given: 7

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.

Kudos [?]: 4 [0], given: 7

1 KUDOS received
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Joined: 04 Feb 2016
Posts: 10

Kudos [?]: 1 [1], given: 11

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.

Kudos [?]: 1 [1], given: 11

Intern
Intern
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B
Joined: 10 Nov 2013
Posts: 20

Kudos [?]: 4 [0], given: 7

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?

Kudos [?]: 4 [0], given: 7

Re: Working together, Joe and Joanne finish a job in 2 hours. How long wil   [#permalink] 08 Aug 2017, 13:15
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