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

It is currently 27 Aug 2014, 19:52

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

A certain hall contains two cuckoo clocks. If the first

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Intern
Intern
avatar
Joined: 18 Apr 2011
Posts: 29
Location: United States
WE: Information Technology (Computer Software)
Followers: 0

Kudos [?]: 12 [0], given: 28

GMAT ToolKit User
A certain hall contains two cuckoo clocks. If the first [#permalink] New post 24 Nov 2012, 07:22
1
This post was
BOOKMARKED
00:00
A
B
C
D
E

Difficulty:

  55% (medium)

Question Stats:

49% (03:53) correct 51% (02:20) wrong based on 45 sessions
A certain hall contains two cuckoo clocks. If the first clock chirps 20 times per hour and the second clock chirps 10 times per hour, and both clocks begin chirping at 1:15 PM, at what time will the first clock have chirped three times as many times as the second clock can per hour?

A. 1:24 PM
B. 2:05 PM
C. 2:30 PM
D. 2:45 PM
E. 4:15 PM
[Reveal] Spoiler: OA
Intern
Intern
avatar
Status: Life begins at the End of your Comfort Zone
Joined: 31 Jul 2011
Posts: 47
Location: Tajikistan
Concentration: General Management, Technology
GPA: 3.86
Followers: 1

Kudos [?]: 22 [0], given: 4

GMAT Tests User
Re: A certain hall contains two cuckoo clocks [#permalink] New post 24 Nov 2012, 10:44
I would go with the (D), below I expound upon my choice.
First clcock chirps 20 times per hour , that means 20/60 = 1/3 times per minute.
Second clock chirps 10 times per hour, that would be 10/60 = 1/6 times per minute.
We are asked: at what time will the first clock have chirped three times as many times as the second clock can per hour, or in other words 3 times as many as the second one 3*1/6 = 1/2 and we get the proportion:
1 - 1/3
x - 1/2 from here x = 3/2 =1*(1/2), i.e. 1 hour 30 minutes or 1:15 PM + 1 hour 30 minutes = 2:45
Please, feel free to correct me, if I went awry
_________________

God loves the steadfast.

Intern
Intern
avatar
Joined: 18 Apr 2011
Posts: 29
Location: United States
WE: Information Technology (Computer Software)
Followers: 0

Kudos [?]: 12 [0], given: 28

GMAT ToolKit User
Re: A certain hall contains two cuckoo clocks [#permalink] New post 26 Nov 2012, 07:47
Javoni wrote:
I would go with the (D), below I expound upon my choice.
First clcock chirps 20 times per hour , that means 20/60 = 1/3 times per minute.
Second clock chirps 10 times per hour, that would be 10/60 = 1/6 times per minute.
We are asked: at what time will the first clock have chirped three times as many times as the second clock can per hour, or in other words 3 times as many as the second one 3*1/6 = 1/2 and we get the proportion:
1 - 1/3
x - 1/2 from here x = 3/2 =1*(1/2), i.e. 1 hour 30 minutes or 1:15 PM + 1 hour 30 minutes = 2:45
Please, feel free to correct me, if I went awry


I think your solution makes sense :)
Intern
Intern
avatar
Joined: 30 Oct 2012
Posts: 3
Followers: 0

Kudos [?]: 0 [0], given: 9

Re: A certain hall contains two cuckoo clocks [#permalink] New post 26 Nov 2012, 07:56
I agree with the solution.
So the slower clock can tick 10 times per hour, and according to the problem we want to know when the faster one can potentially tick 10*3 times= 30
Hence 30/20=1.5 or one hour and a half later. Adding this to 1:15 pm the result should be D, or 2:45 pm.
Re: A certain hall contains two cuckoo clocks   [#permalink] 26 Nov 2012, 07:56
    Similar topics Author Replies Last post
Similar
Topics:
2 Experts publish their posts in the topic Two pumps are connected to a certain empty container at the goodyear2013 4 27 Jul 2014, 08:15
Experts publish their posts in the topic A test consists of two sections. The first section contains Gnpth 1 29 Jun 2014, 21:39
13 Experts publish their posts in the topic A row of seats in a movie hall contains 10 seats. 3 Girls harshjoshi91 19 17 Aug 2010, 01:21
Two glasses contain milk and water. In the first glass the krisrini 8 05 Jan 2006, 03:32
For a certain performance at a concert hall, a total of tbetten 6 22 Jun 2005, 15:50
Display posts from previous: Sort by

A certain hall contains two cuckoo clocks. If the first

  Question banks Downloads My Bookmarks Reviews Important topics  


cron

GMAT Club MBA Forum Home| About| Privacy Policy| 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®.