• Free Practice Test & Review
How would you score if you took the GMAT

Available with Beat the GMAT members only code

• 1 Hour Free
BEAT THE GMAT EXCLUSIVE

Available with Beat the GMAT members only code

• Award-winning private GMAT tutoring
Register now and save up to \$200

Available with Beat the GMAT members only code

• Free Veritas GMAT Class
Experience Lesson 1 Live Free

Available with Beat the GMAT members only code

• Get 300+ Practice Questions

Available with Beat the GMAT members only code

• Most awarded test prep in the world
Now free for 30 days

Available with Beat the GMAT members only code

• Free Trial & Practice Exam
BEAT THE GMAT EXCLUSIVE

Available with Beat the GMAT members only code

• 5 Day FREE Trial
Study Smarter, Not Harder

Available with Beat the GMAT members only code

• Magoosh
Study with Magoosh GMAT prep

Available with Beat the GMAT members only code

• 5-Day Free Trial
5-day free, full-access trial TTP Quant

Available with Beat the GMAT members only code

## from GMATprep

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

#### from GMATprep

Thu Dec 14, 2006 11:09 am
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

aim-wsc Legendary Member
Joined
20 Apr 2006
Posted:
2470 messages
Followed by:
14 members
85
Target GMAT Score:
801-
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.

_________________
Getting started @BTG?

Please do not PM me, (not active anymore) contact Eric.

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

thankont Senior | Next Rank: 100 Posts
Joined
15 Dec 2006
Posted:
41 messages
Followed by:
1 members
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

### Best Conversation Starters

1 lheiannie07 112 topics
2 ardz24 71 topics
3 Roland2rule 69 topics
4 LUANDATO 53 topics
5 swerve 45 topics
See More Top Beat The GMAT Members...

### Most Active Experts

1 GMATGuruNY

The Princeton Review Teacher

154 posts
2 Rich.C@EMPOWERgma...

EMPOWERgmat

107 posts
3 Jeff@TargetTestPrep

Target Test Prep

106 posts
4 Scott@TargetTestPrep

Target Test Prep

98 posts
5 EconomistGMATTutor

The Economist GMAT Tutor

91 posts
See More Top Beat The GMAT Experts