Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized for You

we will pick new questions that match your level based on your Timer History

Track Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:

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

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).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email. _________________

Re: If Ruth began a job and worked continuously until she [#permalink]
18 Oct 2014, 11:46

Answer will in this form: some time of the day.

To get that we need 2 things, start time and rate.

From 1, we get start time which is 8:15am and we are told that at 12 its half of the work so we can calculate when she finished. Don't waste your time on calculating the time. its not needed.

From 2, we know only know rate of work but no start time so numerous end time are possible. No sufficient.

ANSWER: A

boomtangboy 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.

(2) She was finished exactly 7.5 hours after she had started.