Last visit was: 05 Nov 2024, 07:22 It is currently 05 Nov 2024, 07:22

Close

GRE Prep 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 GRE 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
Manager
Manager
Joined: 04 Jan 2019
Posts: 62
Own Kudos [?]: 114 [0]
Given Kudos: 5
Send PM
Manager
Manager
Joined: 26 Mar 2021
Posts: 82
Own Kudos [?]: 161 [1]
Given Kudos: 6
GMAT 1: 660 Q49 V31
GMAT 2: 660 Q48 V33
Send PM
Verbal Expert
Joined: 18 Apr 2015
Posts: 29891
Own Kudos [?]: 36122 [0]
Given Kudos: 25919
Send PM
Manager
Manager
Joined: 04 Jan 2019
Posts: 62
Own Kudos [?]: 114 [1]
Given Kudos: 5
Send PM
Machine X, working alone at a constant rate, produces w widgets in 15 [#permalink]
1
Carcass wrote:
Also the problem is to show and explain the concept of work/rate

It does not provide any answer choices


Corrected sir!
Verbal Expert
Joined: 18 Apr 2015
Posts: 29891
Own Kudos [?]: 36122 [0]
Given Kudos: 25919
Send PM
Re: Machine X, working alone at a constant rate, produces w widgets in 15 [#permalink]
Expert Reply
Thank you Sir
Retired Moderator
Joined: 16 Apr 2020
Status:Founder & Quant Trainer
Affiliations: Prepster Education
Posts: 1546
Own Kudos [?]: 3208 [1]
Given Kudos: 172
Location: India
WE:Education (Education)
Send PM
Re: Machine X, working alone at a constant rate, produces w widgets in 15 [#permalink]
1
harishsridharan wrote:
Machine X, working alone at a constant rate, produces w widgets in 15 minutes. Machine Y, working alone at a constant rate, takes twice as much time to produce w widgets. How long, working simultaneously at their respective rates, would it take both machines working together to complete 4w widgets?


Show: :: OA
40


Concept: If X can do a piece of job in \(A\) minutes while Y and can do the same job in \(B\) minutes, working together they can finish the job in \(\frac{AB}{(A + B)}\) minutes.

So, both machines can make \(w\) widgets in \(\frac{(15)(30)}{(15 + 30)} = 10\) minutes
Therefore, \(4w\) widgets can be made in \((4)(10) = 40\) minutes
Prep Club for GRE Bot
Re: Machine X, working alone at a constant rate, produces w widgets in 15 [#permalink]
Moderators:
GRE Instructor
77 posts
GRE Forum Moderator
37 posts
Moderator
1111 posts
GRE Instructor
228 posts

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