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Re: If Ruth began a job and worked continuously until she [#permalink]
08 Apr 2012, 09:43

4

This post received KUDOS

Expert's post

If Ruth began a job and worked continuously until she finished, at what time of day did she finish the job?

(1) She started the job at 8:15 a.m. and at noon of the same day she had worked exactly half of the time that it took her to do the whole job --> at noon of the same day, so after 3 hours and 45 minutes she started, Ruth had worked HALF OF THE TIME that it took her to do the whole job, which means that the total time it took Ruth to do the whole job is 7.5 hours, so she finished the job at 8:15 a.m+7.5 hours=15:45 p.m. Sufficient.

So as you can see we are not concerned about her rate at all.

(2) She was finished exactly 7.5 hours after she had started. Not sufficient, since we don't know at what time Ruth started the job.

Re: If Ruth began a job and worked continuously until she [#permalink]
10 Apr 2012, 04:38

Bunuel wrote:

If Ruth began a job and worked continuously until she finished, at what time of day did she finish the job?

(1) She started the job at 8:15 a.m. and at noon of the same day she had worked exactly half of the time that it took her to do the whole job --> at noon of the same day, so after 3 hours and 45 minutes she started, Ruth had worked HALF OF THE TIME that it took her to do the whole job, which means that the total time it took Ruth to do the whole job is 7.5 hours, so she finished the job at 8:15 a.m+7.5 hours=15:45 p.m. Sufficient.

So as you can see we are not concerned about her rate at all.

(2) She was finished exactly 7.5 hours after she had started. Not sufficient, since we don't know at what time Ruth started the job.

Answer: A.

But what if she increased the rate at which she worked, then the time taken would be less. Thus we would not be able to calculate the time at which she finished

Still confused _________________

Giving +1 kudos is a better way of saying 'Thank You'.

Re: If Ruth began a job and worked continuously until she [#permalink]
10 Apr 2012, 04:48

Expert's post

boomtangboy wrote:

Bunuel wrote:

If Ruth began a job and worked continuously until she finished, at what time of day did she finish the job?

(1) She started the job at 8:15 a.m. and at noon of the same day she had worked exactly half of the time that it took her to do the whole job --> at noon of the same day, so after 3 hours and 45 minutes she started, Ruth had worked HALF OF THE TIME that it took her to do the whole job, which means that the total time it took Ruth to do the whole job is 7.5 hours, so she finished the job at 8:15 a.m+7.5 hours=15:45 p.m. Sufficient.

So as you can see we are not concerned about her rate at all.

(2) She was finished exactly 7.5 hours after she had started. Not sufficient, since we don't know at what time Ruth started the job.

Answer: A.

But what if she increased the rate at which she worked, then the time taken would be less. Thus we would not be able to calculate the time at which she finished

Still confused

We are told that 3 hours and 45 minutes is HALF OF THE TIME that it took her to do the whole job. If 3 hours and 45 minutes is half of the time then the total time it took Ruth to do the whole job is 7.5 hours. _________________

Re: If Ruth began a job and worked continuously until she [#permalink]
21 Jun 2014, 11:05

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