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

It is currently 26 Jun 2019, 15:39

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

Pipe A can fill a tank in 3 hours. If pipe B can fill the same tank in

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

Hide Tags

 
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 55801
Pipe A can fill a tank in 3 hours. If pipe B can fill the same tank in  [#permalink]

Show Tags

New post 07 Jan 2019, 04:04
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

78% (01:23) correct 22% (01:48) wrong based on 62 sessions

HideShow timer Statistics


CEO
CEO
User avatar
P
Joined: 18 Aug 2017
Posts: 3947
Location: India
Concentration: Sustainability, Marketing
GPA: 4
WE: Marketing (Energy and Utilities)
GMAT ToolKit User Premium Member CAT Tests
Pipe A can fill a tank in 3 hours. If pipe B can fill the same tank in  [#permalink]

Show Tags

New post Updated on: 08 Jan 2019, 01:47
2
Bunuel wrote:
Pipe A can fill a tank in 3 hours. If pipe B can fill the same tank in 2 hours, how many minutes will it take both pipes to fill of the tank?

A. 30
B. 48
C. 54
D. 60
E. 72


combined rate ' 1/3+1/2 = 5/6
time 6/5 * 60 = 72
2/3 * 72 = 48 mins IMO B

or say
180 mins and 120 mins

1/180 + 1/120 ; 5/360 ; 72 mins
2/3 * 72 = 48 mins IMO B
_________________
If you liked my solution then please give Kudos. Kudos encourage active discussions.

Originally posted by Archit3110 on 07 Jan 2019, 04:15.
Last edited by Archit3110 on 08 Jan 2019, 01:47, edited 2 times in total.
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 55801
Re: Pipe A can fill a tank in 3 hours. If pipe B can fill the same tank in  [#permalink]

Show Tags

New post 08 Jan 2019, 01:43
Archit3110 wrote:
Bunuel wrote:
Pipe A can fill a tank in 3 hours. If pipe B can fill the same tank in 2 hours, how many minutes will it take both pipes to fill of the tank?

A. 30
B. 48
C. 54
D. 60
E. 72


Bunuel : answer choice given seems to be incorrect correct option should be e 72.


combined rate ' 1/3+1/2 = 5/6
time 6/5 * 60 = 72 IMO E

or say
180 mins and 120 mins

1/180 + 1/120 ; 5/360 ; 72 mins E ..


Sorry Archit. There was a copy/paste error. Corrected question reads: how many minutes will it take both pipes to fill 2/3 of the tank? Edited. Thank you.
_________________
Director
Director
User avatar
D
Joined: 18 Jul 2018
Posts: 953
Location: India
Concentration: Finance, Marketing
WE: Engineering (Energy and Utilities)
Premium Member Reviews Badge CAT Tests
Re: Pipe A can fill a tank in 3 hours. If pipe B can fill the same tank in  [#permalink]

Show Tags

New post 12 Mar 2019, 10:09
1
Total work to be done is LCM(2,3) = 6 units.
A can do 3 units in 1 hour.
B can do 2 units in 1 hour.
Together they can do 5 units in 1 hour.
They require 6/5 hours to fill the tank completely.
To fill 2/3 of the tank, they require 2/3*6/5*60 min = 48 min.

B is the answer.
_________________
Press +1 Kudos If my post helps!
Senior Manager
Senior Manager
avatar
G
Joined: 25 Feb 2019
Posts: 330
CAT Tests
Re: Pipe A can fill a tank in 3 hours. If pipe B can fill the same tank in  [#permalink]

Show Tags

New post 12 Mar 2019, 10:14
IMO B .

together they can fill full tank in 6/5 hours = 72 mins .

so 2/3 tank will fill in 72*2/3 = 48 mins

Posted from my mobile device
Intern
Intern
avatar
B
Joined: 19 Apr 2017
Posts: 21
Location: Brazil
Concentration: Finance, Entrepreneurship
GPA: 3
Reviews Badge
Pipe A can fill a tank in 3 hours. If pipe B can fill the same tank in  [#permalink]

Show Tags

New post 12 Mar 2019, 10:14
Considering x as the capacity of the tank

Flow rate of pipe A per minute: \(\frac{x}{(3*60)}=\frac{x}{180}\)

Flow rate of pipe B per minute: \(\frac{x}{(2*60)}=\frac{x}{120}\)

Flow rate of both pipes working together:

\(\frac{x}{120}+\frac{x}{180}=\frac{5x}{360}=\frac{x}{72}\)

\(\frac{x}{72}*t=\frac{2*x}{3}\)

\(t=48min\)

Ans B
CEO
CEO
User avatar
P
Joined: 18 Aug 2017
Posts: 3947
Location: India
Concentration: Sustainability, Marketing
GPA: 4
WE: Marketing (Energy and Utilities)
GMAT ToolKit User Premium Member CAT Tests
Re: Pipe A can fill a tank in 3 hours. If pipe B can fill the same tank in  [#permalink]

Show Tags

New post 12 Mar 2019, 10:26
Bunuel wrote:
Pipe A can fill a tank in 3 hours. If pipe B can fill the same tank in 2 hours, how many minutes will it take both pipes to fill \(\frac{2}{3}\) of the tank?

A. 30

B. 48

C. 54

D. 60

E. 72


combined rate = 1/3+1/2 = 5/6
so for 2/3 filling
2/3 = 5/6 * time * 1/60
so
time = 2*6*60/3*5 = 48
IMO B
_________________
If you liked my solution then please give Kudos. Kudos encourage active discussions.
Senior Manager
Senior Manager
User avatar
G
Joined: 09 Aug 2017
Posts: 343
Re: Pipe A can fill a tank in 3 hours. If pipe B can fill the same tank in  [#permalink]

Show Tags

New post 12 Mar 2019, 18:10
I think question is edited now. Because previously 2/3rd was written as 2323.
Target Test Prep Representative
User avatar
D
Status: Founder & CEO
Affiliations: Target Test Prep
Joined: 14 Oct 2015
Posts: 6680
Location: United States (CA)
Re: Pipe A can fill a tank in 3 hours. If pipe B can fill the same tank in  [#permalink]

Show Tags

New post 14 Mar 2019, 17:01
Bunuel wrote:
Pipe A can fill a tank in 3 hours. If pipe B can fill the same tank in 2 hours, how many minutes will it take both pipes to fill \(\frac{2}{3}\) of the tank?

A. 30

B. 48

C. 54

D. 60

E. 72


The rate of pipe A is 1/3, and the rate of pipe B is 1/2. We let n = the time that the two pipes work together to fill 2/3 of the tank and create the equation:

(1/3)n + (1/2)n = 2/3

Multiplying by 6, we have:

2n + 3n = 4

5n = 4

n = 4/5 hour = 48 minutes

Answer: B
_________________

Scott Woodbury-Stewart

Founder and CEO

Scott@TargetTestPrep.com
TTP - Target Test Prep Logo
122 Reviews

5-star rated online GMAT quant
self study course

See why Target Test Prep is the top rated GMAT quant course on GMAT Club. Read Our Reviews

If you find one of my posts helpful, please take a moment to click on the "Kudos" button.

GMAT Club Bot
Re: Pipe A can fill a tank in 3 hours. If pipe B can fill the same tank in   [#permalink] 14 Mar 2019, 17:01
Display posts from previous: Sort by

Pipe A can fill a tank in 3 hours. If pipe B can fill the same tank in

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


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