• Economist Test Prep
    Free Trial & Practice Exam
    BEAT THE GMAT EXCLUSIVE

    Available with Beat the GMAT members only code

    MORE DETAILS
    Economist Test Prep
  • Magoosh
    Magoosh
    Study with Magoosh GMAT prep

    Available with Beat the GMAT members only code

    MORE DETAILS
    Magoosh
  • Veritas Prep
    Free Veritas GMAT Class
    Experience Lesson 1 Live Free

    Available with Beat the GMAT members only code

    MORE DETAILS
    Veritas Prep
  • PrepScholar GMAT
    5 Day FREE Trial
    Study Smarter, Not Harder

    Available with Beat the GMAT members only code

    MORE DETAILS
    PrepScholar GMAT
  • Kaplan Test Prep
    Free Practice Test & Review
    How would you score if you took the GMAT

    Available with Beat the GMAT members only code

    MORE DETAILS
    Kaplan Test Prep
  • EMPOWERgmat Slider
    1 Hour Free
    BEAT THE GMAT EXCLUSIVE

    Available with Beat the GMAT members only code

    MORE DETAILS
    EMPOWERgmat Slider
  • Varsity Tutors
    Award-winning private GMAT tutoring
    Register now and save up to $200

    Available with Beat the GMAT members only code

    MORE DETAILS
    Varsity Tutors
  • Target Test Prep
    5-Day Free Trial
    5-day free, full-access trial TTP Quant

    Available with Beat the GMAT members only code

    MORE DETAILS
    Target Test Prep
  • e-gmat Exclusive Offer
    Get 300+ Practice Questions
    25 Video lessons and 6 Webinars for FREE

    Available with Beat the GMAT members only code

    MORE DETAILS
    e-gmat Exclusive Offer

from GMATprep

This topic has 3 member replies
d77 Newbie | Next Rank: 10 Posts Default Avatar
Joined
13 Dec 2006
Posted:
6 messages

from GMATprep

Post Thu Dec 14, 2006 11:09 am
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    Circular gears P and Q start roating at the same time at constant speeds.gear P makes 10 revolutions per minute and gear Q makes 40 revolutions per minute.
    How many seconds after the gears start roating will gear Q have made exactly 6 more revolutions then gear p?

    6
    8
    10
    12
    15

    Quote:
    12

    Need free GMAT or MBA advice from an expert? Register for Beat The GMAT now and post your question in these forums!
    thankont Senior | Next Rank: 100 Posts
    Joined
    15 Dec 2006
    Posted:
    41 messages
    Followed by:
    1 members
    Post Fri Dec 15, 2006 2:03 pm
    One approach could be this :
    first case 1/6 rev. per sec
    second case 2/3 rev. per sec
    if we substitute 12 sec we get 2 rev for first case and 8 rev for second
    so difference is 6

    800guy Master | Next Rank: 500 Posts Default Avatar
    Joined
    27 Jun 2006
    Posted:
    354 messages
    Followed by:
    5 members
    Thanked:
    11 times
    Post Sat Dec 16, 2006 9:04 pm
    thanks, thankont!

    aim-wsc Legendary Member
    Joined
    20 Apr 2006
    Posted:
    2470 messages
    Followed by:
    14 members
    Thanked:
    85 times
    Target GMAT Score:
    801-
    Post Mon Dec 18, 2006 10:27 am
    May be a lil exp to answer:

    Gear P has 10 revolution per min
    & G Q has 40

    that means ever one revolution of P, Q revolves around four times.

    after 2 revolution of P, Q would have revolved around itself 8 times.
    in other words would have made 6 more rotations.

    P takes 1/10 mins for one revolution. therefore 12 secs for 2 revolution.
    Answer 12

    _________________
    Getting started @BTG?
    Beginner's Guide to GMAT | Beating GMAT & beyond
    Please do not PM me, (not active anymore) contact Eric.

    Best Conversation Starters

    1 Vincen 203 topics
    2 Roland2rule 65 topics
    3 lheiannie07 57 topics
    4 ardz24 44 topics
    5 lionsshare 14 topics
    See More Top Beat The GMAT Members...

    Most Active Experts

    1 image description Brent@GMATPrepNow

    GMAT Prep Now Teacher

    157 posts
    2 image description Rich.C@EMPOWERgma...

    EMPOWERgmat

    103 posts
    3 image description GMATGuruNY

    The Princeton Review Teacher

    98 posts
    4 image description Jay@ManhattanReview

    Manhattan Review

    95 posts
    5 image description Matt@VeritasPrep

    Veritas Prep

    80 posts
    See More Top Beat The GMAT Experts