BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem
TTP OnDemand GMAT Video Course
Featured Course

Target Test Prep GMAT OnDemand

Scott Woodbury-Stewart’s private virtual classroom — 400 hours of master-class video lessons for the GMAT Focus Edition.

  • 715+ score guarantee — highest in the industry (99th percentile)
  • 52 chapters · 1,500+ lessons · 4,000+ practice questions
  • 400 hours of video · 1,500+ instructor-led HD smartboard lessons
  • 300,000+ students accepted to Harvard, Stanford, Wharton, Booth & Sloan & more
  • 24/7 live support + weekly Zoom office hours with GMAT instructors
  • TTP AI Assist — 24/7 AI-powered virtual tutor for instant help
  • 1,200+ flashcards + AI-powered study assistant & daily calendar
  • OnDemand, LiveTeach & GMAT Bootcamp formats available
  • Also: GRE, SAT Math & Executive Assessment courses
  • MBA Admissions Consulting now available
  • 🏆 2025 EdTech Breakthrough Award: Test Prep Solution Provider of the Year
  • 200,000+ students served
  • 5-day free trial — $0 to start, no auto-billing, cancel anytime
★★★★★ 5.0 (559 reviews)
130-pt guarantee
$0 to start then $127/mo
Start Free 5-Day Trial Read 559 Reviews →

Motion

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Source: — Problem Solving |
Senior | Next Rank: 100 Posts
Posts: 71
Joined: Wed Mar 17, 2010 1:31 pmFollowed by: 1 member
Thanked: 5 times

by newton9 » Thu Apr 01, 2010 9:39 am
Yes D is the answer.

How do you feel Knewton's method of teaching? I am planning to give it a try. Are you learning anything new? Do you feel it is useful.

THanks in advance.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Newbie | Next Rank: 10 Posts
Posts: 3
Joined: Tue Dec 08, 2009 2:03 pm

by a_gmat » Thu Apr 01, 2010 9:49 am
Given to us : Distance is 2^m+1

speed of Tm = 2^m
speed of Tn = 2^n
n > m
speed of Tn relative to Tm = 2^n - 2^m = 2^m {( 2^(n-m)) -1}

S = d / t

time = 2^m*2 / 2^m {( 2^(n-m)) -1}
time = 2/2^(n-m) -1

Let me know if the solution looks incorrect.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Newbie | Next Rank: 10 Posts
Posts: 3
Joined: Tue Dec 08, 2009 2:03 pm

by a_gmat » Fri Apr 02, 2010 8:00 am
newton9,

I took knewton course early this year. To be honest I did not find the course very helpful on verbal side. The course goes over most of the general topics in verbal and most of the problems are similar to OG or based on OG type questions. If you are looking for something that can build your concepts than I would not suggest the course. If you have already done most of the prep work and you are looking for something to get you in the grove then go for it.

Before you make any decision do try their free class just to get an idea how the course works.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
MBA Student
Posts: 403
Joined: Tue Dec 22, 2009 7:32 pmFollowed by: 22 members
Thanked: 98 times

by fibbonnaci » Fri Apr 02, 2010 10:00 am
hey Bhumika,
the easy way to solve such problems is to plug in numbers.
i assume, m= 2 and n=3
accordingly, speed of train m= 4 miles/hr
speed of train n = 8 miles/hr

the distance between them is 8 miles.

according to relative velocity, when two objects are moving in the same direction then their speeds subtract (8-4 = 4)

to find the time:distance/speed
8/4 => 2 hrs.

now substitute the values of m and n in the answer choices and see which option gives you the value of 2.
Only D does that.

Hope this helps!
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Legendary Member
Posts: 2326
Joined: Mon Jul 28, 2008 3:54 amFollowed by: 2 members
Thanked: 173 times
GMAT Score:710

by gmatmachoman » Sat Apr 03, 2010 11:35 am
bhumika.k.shah wrote:This is the best i could get to put this q here.

Source - knewton CAT
Bhumika,

This one deals with Relative speeds.
Since n > m, relative speed between the 2 trains is ((2^n)-(2^m)){ read( 2 power n) -(2 power m))

then , Time taken to catch up =Distance /Speed
So apply the values and U can easily see the option D to be poping up there...

Sometimes forumal helps..

I am not against plugging numbers, but TIME is our enemy!!
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1