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.

It appears that you are browsing the GMAT Club forum unregistered!

Signing up is free, quick, and confidential.
Join other 500,000 members and get the full benefits of GMAT Club

Registration gives you:

Tests

Take 11 tests and quizzes from GMAT Club and leading GMAT prep companies such as Manhattan GMAT,
Knewton, and others. All are free for GMAT Club members.

Applicant Stats

View detailed applicant stats such as GPA, GMAT score, work experience, location, application
status, and more

Books/Downloads

Download thousands of study notes,
question collections, GMAT Club’s
Grammar and Math books.
All are free!

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:

3 machines have a productivity ratio of 1 to 2 to 5. All 3 [#permalink]

Show Tags

16 Feb 2011, 03:34

2

This post received KUDOS

16

This post was BOOKMARKED

00:00

A

B

C

D

E

Difficulty:

55% (hard)

Question Stats:

67% (02:49) correct
33% (02:27) wrong based on 135 sessions

HideShow timer Statistics

3 machines have a productivity ratio of 1 to 2 to 5. All 3 machines are working on a job for 3 hours. At the beginning of the 4th hour, the slowest machine breaks. It is fixed at the beginning of hour seven, and begins working again. The job is done in nine hours. What was the ratio of the work performed by the fastest machine as compared to the slowest?

3 machines have a productivity ratio of 1:2:5. all 3 machines are working on a job for 3 hours. at the beginning of the 4th hour, the slowest machine breaks. it is fixed at the beginning at hour 7, and begins working again. the job is done in 9 hours. what was the ratio of the work performed by the fastest machine to the work performed by the slowest?

"3 machines have a productivity ratio of 1:2:5" means that in a time interval (1 hour, 1 year, ...) the first machine can produce 1 part (so it's the slowest one), the second can produce 2 parts and the third and fastest one can produce 5 parts.

Now, the fastest machine worked for whole 9 hours thus produced 9*5=45 parts but the slowest machine worked only for 6 hours thus produced 6*1=6 parts, so the ratio of the work performed by the fastest machine to the work performed by the slowest is 45/6=15/2.
_________________

Re: 3 machines have a productivity ratio of 1 to 2 to 5. All 3 [#permalink]

Show Tags

11 Aug 2011, 05:02

1

This post received KUDOS

ruturaj wrote:

please explain how slowest machine works for 6 hours

slowest machine worked 1st hour 2nd hour 3rd hour Got broken got fixed and returned to work at the beginning of the 7th hour so: 7th hour 8th hour 9th hour

Total of 6 hours.

So the slowest machine made 6 pieces, while the fastest machine made 45
_________________

Re: 3 machines have a productivity ratio of 1 to 2 to 5. All 3 [#permalink]

Show Tags

11 Aug 2011, 07:02

ruturaj wrote:

please explain how slowest machine works for 6 hours

3 machines have a productivity ratio of 1:2:5. all 3 machines are working on a job for 3 hours. at the beginning of the 4th hour, the slowest machine breaks. it is fixed at the beginning at hour 7, and begins working again. the job is done in 9 hours. what was the ratio of the work performed by the fastest machine to the work performed by the slowest?

Productivity ratio of 1:2:5 means;

In 1 hour: Slowest machine just finishes 1 work Medium fast machine finishes 2 work Fastest machine finishes 5 work

3 hours work: Slowest: 3*1=3 work Medium: 3*2=6 work Fastest: 3*5=15 work

THEN SLOWEST BREAKS. It misses(3 hours): 4th hour 5th hour 6th hour

During which: Medium fast completes: 3*2=6 work Fastest completes: 3*5=15 work

Then 7th, 8th, 9th hour(3 hours) Slowest: 3*1=3 work Medium: 3*2=6 work Fastest: 3*5=15 work

Work by fastest:Work by slowest 15+15+15:3+3 45:6 15:2 _________________

Re: 3 machines have a productivity ratio of 1 to 2 to 5. All 3 [#permalink]

Show Tags

02 Dec 2012, 21:49

The productivity ratio of the fastest machine to the slowest machine is 5:1.

The fastest machine worked for 9 straight hours. Thus, W = 5 x 9 = 45 The slowest machine brokedown in the 4th hour and was revived on the 7th hour. Thus, W = 1 x 6 = 6

The Output Ratio of fastest to slowest is 45 is to 6 ==> 15 : 2
_________________

Re: 3 machines have a productivity ratio of 1 to 2 to 5. All 3 [#permalink]

Show Tags

27 Jun 2014, 06:37

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: 3 machines have a productivity ratio of 1 to 2 to 5. All 3 [#permalink]

Show Tags

03 Oct 2015, 03:04

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: 3 machines have a productivity ratio of 1 to 2 to 5. All 3 [#permalink]

Show Tags

11 Oct 2016, 03:42

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.
_________________

Let's say the productivity ratio refers to how many units each produces in 1 hour. The fastest (most productive) machine works for 9 hours and makes 5 per hour, totally 45 units. The slowest (least productive) machine works for 6 hours and produces 1 per hour for a total of 6. Thus, the ratio of units produced fast/slow is 45/6 or 15/2. No more math required
_________________

Dan the GMAT Man Offering tutoring and admissions consulting in the NYC area and online danthegmatman.squarespace.com danthegmatman@gmail.com

Re: 3 machines have a productivity ratio of 1 to 2 to 5. All 3 [#permalink]

Show Tags

05 Jan 2017, 16:19

GMATD11 wrote:

3 machines have a productivity ratio of 1 to 2 to 5. All 3 machines are working on a job for 3 hours. At the beginning of the 4th hour, the slowest machine breaks. It is fixed at the beginning of hour seven, and begins working again. The job is done in nine hours. What was the ratio of the work performed by the fastest machine as compared to the slowest?

A. 5 B 7 C 15/2 D 17/2 E 12

fastest machine's work=9hrs*5 units per hr=45 total units slowest machine's work=6 hrs*1 unit per hr=6 total units 45/6=15/2

gmatclubot

Re: 3 machines have a productivity ratio of 1 to 2 to 5. All 3
[#permalink]
05 Jan 2017, 16:19

Campus visits play a crucial role in the MBA application process. It’s one thing to be passionate about one school but another to actually visit the campus, talk...

Its been long time coming. I have always been passionate about poetry. It’s my way of expressing my feelings and emotions. And i feel a person can convey...

Written by Scottish historian Niall Ferguson , the book is subtitled “A Financial History of the World”. There is also a long documentary of the same name that the...

Post-MBA I became very intrigued by how senior leaders navigated their career progression. It was also at this time that I realized I learned nothing about this during my...