Last visit was: 26 Apr 2026, 15:59 It is currently 26 Apr 2026, 15:59
Home
Messages
Tests
Schools
Events
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.
Go to My Error Log Learn more
Close
Request Expert Reply
Confirm Cancel
User avatar
quantman3
User avatar
Joined: 24 Aug 2011
Last visit: 18 Nov 2011
Posts: 12
Own Kudos:
12
Location: India
GMAT Date: 12-19-2011
WE:Information Technology (Computer Software)
Posts: 12
Kudos: 12
Pipes & Cistern -- Query on basic Concept 24 Aug 2011, 09:47
Kudos
Add Kudos
Bookmarks
Bookmark this Post
I have a query on the basic concept used in Cistern problems-->

Suppose x fills a tank in 'a' mins. Y fills the tank in 'b' mins. And Z empties it in 'c' mins.

Now the net work done in 1 min when all the pipes are together : (1/a+1/b) - 1/c

And time to Fill/Empty the tank = 1/ net work done in 1 min.

Now, the time (to Fill/Empty) is for the COMPLETE tank assuming that when the inlets where opened the tank was empty.. right??

what if we have a problem in which tank is -
1) completely full, and then the 3 inlets (as mentioned above) are open.
2) Or the tank is 1/3 rd full

I think in case 2), we can find the time to empty the complete tank. and then as 1/3 is already full we can find the time required to empty the remaining 2/3 = 2/3 x Time to empty complete tank.

Is this correct?

and what in case1)??

Please help !!!!



Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
Still interested in this question? Check out the "Best Topics" block below for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
User avatar
quantman3
User avatar
Joined: 24 Aug 2011
Last visit: 18 Nov 2011
Posts: 12
Own Kudos:
12
Location: India
GMAT Date: 12-19-2011
WE:Information Technology (Computer Software)
Posts: 12
Kudos: 12
Pipes & Cistern -- Query on basic Concept 25 Aug 2011, 02:59
Kudos
Add Kudos
Bookmarks
Bookmark this Post
30 views and no reply yet!!

cmon ppl share your views on this.



Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!