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

 It is currently 02 Aug 2014, 00:52

### 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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# Al can complete a particular job in 8 hours. Boris can

Author Message
TAGS:
Intern
Joined: 23 Aug 2009
Posts: 17
Followers: 0

Kudos [?]: 3 [0], given: 8

Al can complete a particular job in 8 hours. Boris can [#permalink]  03 Dec 2009, 21:45
00:00

Difficulty:

(N/A)

Question Stats:

100% (02:43) correct 0% (00:00) wrong based on 5 sessions
Al can complete a particular job in 8 hours. Boris can complete the same job in 5. Cody can complete a second job, which requires twice as much work as the first, in 8 hours. If all three people work together on the larger job for 2 hours. How long, in hours, would it take Al, working alone to finish the job?

A. 0.8
B. 3.0
C. 6.8
D. 8.0
E. 8.8

I am confused as to how to evaluate the 2nd statement "Cody can complete a second job, which requires twice as much work as the first, in 8 hours"
_________________

Peace

Senior Manager
Joined: 30 Aug 2009
Posts: 291
Location: India
Concentration: General Management
Followers: 2

Kudos [?]: 87 [1] , given: 5

Re: Work and time [#permalink]  03 Dec 2009, 22:49
1
KUDOS
ro86 wrote:
Al can complete a particular job in 8 hours. Boris can complete the same job in 5. Cody can complete a second job, which requires twice as much work as the first, in 8 hours. If all three people work together on the larger job for 2 hours. How long, in hours, would it take Al, working alone to finish the job?

1. 0.8
2. 3.0
3. 6.8
4. 8.0
5. 8.8
I am confused as to how to evaluate the 2nd statement "Cody can complete a second job, which requires twice as much work as the first, in 8 hours"

the statement means if A and B are doing work "W" then Cody does a work which is "2W"
Now considering they work at the same workrate A will take 16hrs and B will take 10hrs to do the second job.
In 2hrs A,B and C will complete 2/16 + 2/10 + 2/8 = 92/160 part of the work
remaining work is 1-92/160 = 68/160
A does 1/16 part of second job in 1hr so he would require (68/160)/(1/16) = 6.8hrs
Re: Work and time   [#permalink] 03 Dec 2009, 22:49
Similar topics Replies Last post
Similar
Topics:
1 A can complete the job in 2 hours and B can complete the sam 3 17 Mar 2011, 04:21
Frances can complete a job in 12 hours, and Joan can 3 17 Sep 2010, 01:56
Machine A can complete a certain job in x hours. Machine B 2 23 Sep 2007, 22:16
Machine A can complete a certain job in x hours. Machine B 1 16 Jul 2007, 16:25
7 Al can complete a particular job in 8 hours. Boris can 11 11 Jul 2006, 20:20
Display posts from previous: Sort by