Find all School-related info fast with the new School-Specific MBA Forum

 It is currently 24 Aug 2016, 18:27

### GMAT Club Daily Prep

#### 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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# If two copying machines work simultaneously at their

 new topic post reply Question banks Downloads My Bookmarks Reviews Important topics
Author Message
TAGS:

### Hide Tags

Manager
Joined: 06 Apr 2010
Posts: 142
Followers: 3

Kudos [?]: 530 [0], given: 15

If two copying machines work simultaneously at their [#permalink]

### Show Tags

08 Sep 2010, 11:40
00:00

Difficulty:

25% (medium)

Question Stats:

72% (01:25) correct 28% (00:31) wrong based on 64 sessions

### HideShow timer Statistics

If two copying machines work simultaneously at their respective constant rates, how many copies do they produce in 5 minutes?
(1) One of the machines produces copies at the constant rate of 250 copies per minute.
(2) One of the machines produces copies at twice the constant rate of the other machine.
[Reveal] Spoiler: OA
Current Student
Status: What's your raashee?
Joined: 12 Jun 2009
Posts: 1847
Location: United States (NC)
Concentration: Strategy, Finance
Schools: UNC (Kenan-Flagler) - Class of 2013
GMAT 1: 720 Q49 V39
WE: Programming (Computer Software)
Followers: 23

Kudos [?]: 236 [0], given: 52

Re: Copying machines [#permalink]

### Show Tags

08 Sep 2010, 12:05
udaymathapati wrote:
If two copying machines work simultaneously at their respective constant rates, how many copies do they produce in 5 minutes?
(1) One of the machines produces copies at the constant rate of 250 copies per minute.
(2) One of the machines produces copies at twice the constant rate of the other machine.

1. obviously INSUFF since you know nothing about the other machine.
2. INSUFF since you dont know the rate - it could be 10/min or 20/min so end result differs

Combine:
M1 = 250/min
M2 COULD be 500/min OR 125/min since M1 could be the machine that produces 250/min AND the same machine that is twice the rate from 2. so as you can see the end result differrs.

E
_________________

If you like my answers please +1 kudos!

Manager
Joined: 17 Nov 2009
Posts: 239
Followers: 1

Kudos [?]: 36 [0], given: 17

Re: Copying machines [#permalink]

### Show Tags

08 Sep 2010, 13:14
udaymathapati wrote:
If two copying machines work simultaneously at their respective constant rates, how many copies do they produce in 5 minutes?
(1) One of the machines produces copies at the constant rate of 250 copies per minute.
(2) One of the machines produces copies at twice the constant rate of the other machine.

To answer this question I need to know the rates of both the machines. Without that it is not possible to answer the question
St 1: Only gives me one rate
st 2: Just gives me a relation

1+ 2 = Cannot give me anything since I donot know if 250 c/min is the rate of the faster or the slower machine.

Hence E
Re: Copying machines   [#permalink] 08 Sep 2010, 13:14
Similar topics Replies Last post
Similar
Topics:
9 Three machines, K, M, and P, working simultaneously and 9 03 Dec 2012, 03:40
3 Three machines, K, M, and P, working simultaneously and 3 01 Jun 2012, 21:01
3 If two copying machines work simultaneously at their 4 28 Jan 2012, 04:01
4 Three machines, K, M, and P, working simultaneously and 8 04 Sep 2011, 09:45
14 If two copying machines work simultaneously at their 13 08 Sep 2009, 12:35
Display posts from previous: Sort by

# If two copying machines work simultaneously at their

 new topic post reply Question banks Downloads My Bookmarks Reviews Important topics

 Powered by phpBB © phpBB Group and phpBB SEO Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.