It is currently 23 Nov 2017, 04:47

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.

Close

Request Expert Reply

Confirm Cancel

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

Two different holes, hole A and hole B, are put in the bottom of a

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

Hide Tags

Expert Post
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 42323

Kudos [?]: 133100 [0], given: 12408

Two different holes, hole A and hole B, are put in the bottom of a [#permalink]

Show Tags

New post 24 Oct 2017, 23:53
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

89% (00:39) correct 11% (00:35) wrong based on 62 sessions

HideShow timer Statistics

Two different holes, hole A and hole B, are put in the bottom of a full water tank. If the water drains out through the holes, how long will it be before the tank is empty?

(1) If only hole A is put in the bottom, the tank will be empty in 24 minutes.
(2) If only hole B is put in the bottom, the tank will be empty in 42 minutes.
[Reveal] Spoiler: OA

_________________

New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
Extra-hard Quant Tests with Brilliant Analytics

Kudos [?]: 133100 [0], given: 12408

Manager
Manager
User avatar
B
Joined: 17 Oct 2016
Posts: 90

Kudos [?]: 21 [0], given: 72

Location: India
Concentration: Operations, Strategy
GPA: 3.7
WE: Design (Real Estate)
GMAT ToolKit User
Re: Two different holes, hole A and hole B, are put in the bottom of a [#permalink]

Show Tags

New post 25 Oct 2017, 00:03
Option C

From st1 we don’t have the rate of B
From st2 we don’t have the rate of A
Combining we can answer as 168/13 minutes. Hence C

Posted from my mobile device
_________________

Help with kudos if u found the post useful. Thanks

Kudos [?]: 21 [0], given: 72

Manager
Manager
User avatar
B
Joined: 09 Aug 2017
Posts: 59

Kudos [?]: 8 [0], given: 18

Location: United States
Concentration: Technology
GMAT 1: 640 Q44 V33
GMAT 2: 630 Q47 V29
WE: Research (Investment Banking)
CAT Tests
Re: Two different holes, hole A and hole B, are put in the bottom of a [#permalink]

Show Tags

New post 31 Oct 2017, 12:38
Bunuel wrote:
Two different holes, hole A and hole B, are put in the bottom of a full water tank. If the water drains out through the holes, how long will it be before the tank is empty?

(1) If only hole A is put in the bottom, the tank will be empty in 24 minutes.
(2) If only hole B is put in the bottom, the tank will be empty in 42 minutes.


St 1, only gives us information on one of the holes.
St 2, only gives us information on one of the holes.

1+2, we now can calculate the combined rate since we have the rate of each hole. C
_________________

I'd love to hear any feedback or ways to improve my problem solving. I make a lot of silly mistakes. If you've had luck improving on stupid mistakes, I'd love to hear how you did it.

Also, I appreciate any kudos.

Kudos [?]: 8 [0], given: 18

Intern
Intern
avatar
B
Joined: 11 Oct 2017
Posts: 12

Kudos [?]: 0 [0], given: 28

Two different holes, hole A and hole B, are put in the bottom of a [#permalink]

Show Tags

New post 16 Nov 2017, 10:21
Sasindran wrote:
Option C

From st1 we don’t have the rate of B
From st2 we don’t have the rate of A
Combining we can answer as 168/13 minutes. Hence C

Posted from my mobile device


Correct answer Sasindran , but the combined rate is eleven x minute

Solution in case any interested:

Work/leak - Time - Rate
A - 24 -
B - 42 -

We can plug in a value for work/leak
24 = 6x4
42 = 6x7
Work/leak = 6x4x7 = 168

Work/leak - Time - Rate
A 168 - 24 - 7
B 168 - 42 - 4
A+B 168 - 15.27- 11

Kudos [?]: 0 [0], given: 28

Two different holes, hole A and hole B, are put in the bottom of a   [#permalink] 16 Nov 2017, 10:21
Display posts from previous: Sort by

Two different holes, hole A and hole B, are put in the bottom of a

  new topic 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 | Emoji artwork provided by EmojiOne

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®.