Live GMAT classes with Target Test Prep start Nov 21 and Nov 22. First class free.

See classes
Target Test Prep · GMAT

Choose how you want to prepare

Learn live with an expert or move at your own pace. Every option includes the complete TTP study system.

Newsweek Readers’ Choice Awards 2026 winner: Target Test Prep, #1 Test Prep

Target Test Prep was voted #1 Best Test Prep in the 2026 Newsweek Readers’ Choice™ Awards.

★★★★★5.0563 reviews
GMATLiveTeachStarts Nov 22
Josh Braslow, Target Test Prep GMAT expert
LIVE ONLINE CLASSES

Get Ready for GMAT Test Day Faster with Live Online Classes

with Josh Braslow, 20+ years in test prep

Nov 22 · Josh Braslow
Sun · 9:30 AM to 12:30 PM ET
Included
40 hours of live online classes + 6 months of TTP OnDemand
  • Attend the first class for free
  • Every class is recorded, so you never fall behind
View classes & enroll
Limited seats availableTarget Test Prep
EALiveTeachOnDemandStart anytime
EXECUTIVE ASSESSMENT

Target Test Prep EA OnDemand

Self-paced EA prep. Study on your schedule.

EXECUTIVE ASSESSMENT

with

165+ EA score guarantee
$05-day trial no automatic billing
Schedule
Included
40 hours of live online classes plus six months of access to the complete TTP EA OnDemand course.
  • 165+ EA Score Guarantee
  • 4,100+ Quant, Verbal, and Integrated Reasoning practice questions
  • 400+ hours of in-depth video lessons
  • 3,000+ step-by-step video solutions
View EA class & enroll Start free 5-day trial
Limited cohort · enrollment openTrial includes full course accessTarget Test Prep
GMATOnDemandStart anytime
SELF-PACED MASTERCLASS

Target Test Prep GMAT OnDemand

Complete access from day one. Study on your schedule.

715+ score guarantee
$0to start then $127/mo
  • Personalized study plan and analytics
  • Thousands of lessons and practice questions

math og 140

Expert replies
by resilient » Sat Mar 08, 2008 8:53 pm
machines a and b always operate independently and at their respective constant rates. When workin alone, machine a can fill a production lot in 5 hours, and machine b can fill the smae lot in x hours. When the two machines operate simultaneously to fill the production lot, it takes them 2 hours to complete the job. What is the value of x?

qa is 3 1/3


solution 1/5 +1/x= 1/2. Find x for solution. BUt wh 1/2. I dont see how setting it equal to 1/2 will fix the situation? How do I proceed to not make the same mistake again?
Appetite for 700 and I scraped my plate!
Join the discussion
Source: — Problem Solving |

by siddarthd2919 » Sat Mar 08, 2008 9:13 pm
hi engin i am pasting the formula.....this should help you


1/x+1/y=1/h

where x-----time taken for x to do the work alone

y-----time for y to do the work alone

h-----time taken for the work to be done when both x and y work together.
Join the discussion

ok

by resilient » Sun Mar 09, 2008 1:03 am
i see your point. I get it I know this formula. I guess I just got a bit mixwed up in the words. Here we are saying 1 job in 5 hours (a) + 1 job in X hours (B) = 1 job in 2 hours. Now simply find x whivh ever way you want. Either through algebra or backsolving. IS that the ticket?
Appetite for 700 and I scraped my plate!
Join the discussion