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

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Math Expert
Joined: 02 Sep 2009
Posts: 52935
Working together, Joe and Joanne finish a job in 2 hours. How long wil  [#permalink]

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01 Aug 2017, 12:11
00:00

Difficulty:

15% (low)

Question Stats:

83% (01:20) correct 17% (01:16) wrong based on 152 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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Intern
Joined: 21 Jul 2017
Posts: 3
Re: Working together, Joe and Joanne finish a job in 2 hours. How long wil  [#permalink]

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01 Aug 2017, 18:59

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.
Intern
Joined: 10 Nov 2013
Posts: 18
Re: Working together, Joe and Joanne finish a job in 2 hours. How long wil  [#permalink]

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01 Aug 2017, 19:07
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.

Intern
Joined: 04 Feb 2016
Posts: 6
Re: Working together, Joe and Joanne finish a job in 2 hours. How long wil  [#permalink]

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05 Aug 2017, 05:28
1
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.

"" A is sufficient , but the answer is not 6.25 hours, if both worked together - the answer is 0.7 hours.
Intern
Joined: 10 Nov 2013
Posts: 18
Re: Working together, Joe and Joanne finish a job in 2 hours. How long wil  [#permalink]

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08 Aug 2017, 12:15
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.

"" 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?
Non-Human User
Joined: 09 Sep 2013
Posts: 9838
Re: Working together, Joe and Joanne finish a job in 2 hours. How long wil  [#permalink]

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23 Oct 2018, 19:38
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: Working together, Joe and Joanne finish a job in 2 hours. How long wil   [#permalink] 23 Oct 2018, 19:38
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