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

It is currently 26 May 2016, 19:51
GMAT Club Tests

Close

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

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

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

Pumps A,B and C operate at their respective speeds. Pumps A

  post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
Manager
Manager
User avatar
Joined: 22 Nov 2005
Posts: 138
Followers: 1

Kudos [?]: 2 [0], given: 0

Pumps A,B and C operate at their respective speeds. Pumps A [#permalink]

Show Tags

New post 04 Jan 2006, 14:38
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions

HideShow timer Statistics

This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Pumps A,B and C operate at their respective speeds. Pumps A and B operating simultaneously can fill the tank in 6/5 hrs, pumps A and C operating simultaneously can fill the tank in 3/2 hrs and pumps B and C operating simultaneously can fill the tank in 2 hrs. How long does it take pumps A,B and C working simultaneously to fill the tank?

a) 1/3

b) 1/2

c) 2/3

d) 5/6

e) 1

************************************

To my recollecting in a 3 machine combined work problem, the formula is
t=ABC/(AB+BC+AC). The denominator terms are given in the problem but not the numerator...how do I solve this problem? I am sure I am missing something pretty stupid.
Manager
Manager
User avatar
Joined: 22 Nov 2005
Posts: 138
Followers: 1

Kudos [?]: 2 [0], given: 0

 [#permalink]

Show Tags

New post 04 Jan 2006, 14:43
Ignore my request. I found out. As I had thought I missed something stupid. You can solve it if you want to...
Manager
Manager
User avatar
Joined: 31 Jan 2005
Posts: 143
Followers: 1

Kudos [?]: 1 [0], given: 0

 [#permalink]

Show Tags

New post 05 Jan 2006, 13:22
plsubbu...can u post ur workings ????

thanx
_________________

"Nothing is Impossible"

Director
Director
User avatar
Joined: 04 Jan 2006
Posts: 923
Followers: 1

Kudos [?]: 27 [0], given: 0

here is my take.. [#permalink]

Show Tags

New post 05 Jan 2006, 14:29
answer is 1

1/a + 1/b = 5/6
1/a + 1/c = 2/3
1/b + 1/c = 1/2

add lHS and RHS

2(1/a+1/b+1/c) = 5/6 + 2/3 + 1/2
1/a+1/b+1/c = 1/t
so 2(1/t) = 5/6 + 2/3 + 1/2
which is 1/t = 1
i.e t = 1.
here is my take..   [#permalink] 05 Jan 2006, 14:29
Display posts from previous: Sort by

Pumps A,B and C operate at their respective speeds. Pumps A

  post reply Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

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®.