GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 22 Oct 2019, 12:44

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

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

A swimming pool is supplied water by two pipes, P and Q. If pipe P ope

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

Hide Tags

Senior RC Moderator
Joined: 02 Nov 2016
Posts: 4136
GPA: 3.39
A swimming pool is supplied water by two pipes, P and Q. If pipe P ope  [#permalink]

Show Tags

05 Jan 2018, 15:07
00:00

Difficulty:

15% (low)

Question Stats:

77% (00:59) correct 23% (00:52) wrong based on 76 sessions

HideShow timer Statistics

A swimming pool is supplied water by two pipes, P and Q. If pipe P operating alone can fill the pool in 12 hours, how long will it take pipe Q operating alone to fill the pool?

(1) Operating together, pipes P and Q can fill the pool in 4 hours.
(2) Pipe P supplies water at the rate of 520 gallons per hour, and 6240 gallons are required to fill the pool.

_________________
Intern
Joined: 25 Oct 2017
Posts: 5
Re: A swimming pool is supplied water by two pipes, P and Q. If pipe P ope  [#permalink]

Show Tags

05 Jan 2018, 16:04
Statement 1 - let's assume the pool is very small and has a capacity of 24 liters. Pipe P fills the pool up in 12 hours, therefore, it fills 2 liters per hour. Pipes P and Q together fill the pool up in 4 hours, therefore, they fill 6 liters per hour. If P + Q = 6 and P = 2, then Q fills 4 liters per hour, therefore, Q takes 6 hours to fill the pool on its own. Sufficient

Statement 2 - no information about pipe Q. Insufficient

Retired Moderator
Joined: 22 Aug 2013
Posts: 1428
Location: India
Re: A swimming pool is supplied water by two pipes, P and Q. If pipe P ope  [#permalink]

Show Tags

06 Jan 2018, 10:48
A swimming pool is supplied water by two pipes, P and Q. If pipe P operating alone can fill the pool in 12 hours, how long will it take pipe Q operating alone to fill the pool?

(1) Operating together, pipes P and Q can fill the pool in 4 hours.
(2) Pipe P supplies water at the rate of 520 gallons per hour, and 6240 gallons are required to fill the pool.

(1) We are given that pipe P alone fills 1/12 fraction of the pool every hour, and together pipe P and Q fill 1/4 fraction of the pool every hour. So on the basis of this information we can find the fraction supplied by pipe Q (it will be 1/4 - 1/12 = 1/6). This in turn, will give us the time required by pipe Q alone to fill the pool. Sufficient.

(2) This statement gives no information about pipe Q, insufficient.

Re: A swimming pool is supplied water by two pipes, P and Q. If pipe P ope   [#permalink] 06 Jan 2018, 10:48
Display posts from previous: Sort by

A swimming pool is supplied water by two pipes, P and Q. If pipe P ope

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

 Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne