Events & Promotions
|
|
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
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Sep 0201:00 PM EDT
-11:59 PM EDT
Take 30% off all study plans with code COURSEWORK - Expires on Monday 9/7
Sep 0410:00 AM PDT
-11:00 AM PDT
What does test anxiety really look like on the GMAT? For many test takers, it does not look like a panic attack. Instead, it shows up as brain fog, rereading, negative comparisons, mental noise....
Sep 0410:00 AM EDT
-11:59 PM EDT
We’ve worked incredibly hard to build TTP into the best test prep experience possible, and it would mean a lot to us to win Newsweek’s 2026 Readers’ Choice Award for Best Test Prep. If TTP has helped you, we’d be incredibly grateful for your vote.
Sep 0609:30 AM EDT
-12:30 PM EST
Top scores are possible when you enroll in a powerful EA course, taught live online + 6 months access to TTP OnDemand video courses included! Perfect class schedule and easy course access for working professionals. Class starts Sundays Sept. 6, 2026.- Sep 07
12:01 AM PDT
-11:59 PM PDT
On the 7th, GMAT Club Tests will be Free! Including all the Quizzes, Questions, and Tests. 12 AM - 11:59 PM PDT - Sep 07
10:00 AM PDT
-11:00 AM PDT
A complete walkthrough of GMAT Club’s free 12-week GMAT study plan: what you study each week, how progress and goals are tracked, how the error log works, and how your practice unlocks paid tools at no cost. - Sep 09
07:00 AM PDT
-10:00 AM PDT
Meet AdComs and explore top Master’s programs - MiM, MiF, MSc, MSBA and more. - Application Fee Waivers - Free 1-Week of GMAT Club Tests: - Master's Application Toolkit - Grand Prize Giveaway - Sep 09
10:00 AM PDT
-11:00 AM PDT
Three MBA applications. Three rejections. No interview invites. A year later, Aman was admitted to Cambridge Judge, SMU, and IMD. In this episode of MBA Admit Stories, Aman shares how he rebuilt his MBA application... 
Sep 1507:00 PM EDT
-09:00 PM EST
Elite scores are possible when you enroll in a powerful GMAT course, taught live online + 6 months access to TTP OnDemand video courses included! Class starts Tues/Thurs Sept. 15, 2026 - Nov. 15, 2027, 7:00pm-9:00pm EST
Sep 2108:00 PM EDT
-10:00 PM EDT
Boost your GMAT score in less than one month in a live online class + 6 months access to TTP OnDemand video courses included! Class starts Mon, Tues, Wed, Thur, Fri Sept. 21, 2026 - Oct. 9, 2027, 7:00pm-10:00pm EST
22 Dec 2020, 09:28
Kudos
Bookmarks
D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
76% (02:20) correct
24%
(02:41)
wrong
based on 283
sessions
History
Date
Time
Result
Not Attempted Yet
Working together machines A and B can complete a certain job in 6 hours. If it takes machine A 40% longer than it takes A and B together to complete the same job, then how long would it take machine B to complete the job working alone?
(A) 9
(B) 12
(C) 18
(D) 21
(E) 24
(A) 9
(B) 12
(C) 18
(D) 21
(E) 24
22 Dec 2020, 19:43
Kudos
Bookmarks
sjuniv32
Machine A takes 40% more time than A and B together. So time taken by A alone = 1.4 * 6 = 8.4 Hours.
Work done by A in 1 hour = \(\frac{1}{8.4} = \frac{10}{84} = \frac{5}{42}\)
Work done by B in 1 hour = \(\frac{1}{B}\)
Work done together in 1 hour = \(\frac{1}{6}\)
Therefore \(\frac{5}{42}+ \frac{1}{B} = \frac{1}{6}\)
\(\frac{1}{B} = \frac{1}{6} - \frac{5}{42} = \frac{7 - 5}{42} = \frac{2}{42}= \frac{1}{21}\)
Therefore B = 21 hours
Option D
Arun Kumar
22 Dec 2020, 21:06
Kudos
Bookmarks
sjuniv32
It takes A: \(6*1.4 = 8.4 = 8+\frac{2}{5} = \frac{42}{5}\) hours to complete the job. A and B together take 6 hours to complete the job. The rate of A+B is \(\frac{1}{6}\) while the rate of A is \(\frac{1}{8.4} = \frac{5}{42}\).
Then B's rate alone would be \(\frac{1}{6} - \frac{5}{42} = \frac{7 - 5}{42} = \frac{2}{42} = \frac{1}{21}\). Thus it takes B 21 days alone.
Ans: D
