Find all School-related info fast with the new School-Specific MBA Forum
Learn more about the recent changes... close

It is currently 23 May 2013, 08:16
Customize  |  Hide

Search
Register
New posts
Unanswered

A locomotive engine without a train can run at 24mph. The

  Question banks Downloads My Bookmarks Reviews  
  Oldest Best Reply
Search for:
 
Print view
First unread post
Author Message
TAGS:
Senior Manager
Senior Manager
User avatar
Joined: 20 Dec 2004
Posts: 268
Followers: 6

Kudos [?]: 43 [0], given: 0

GMAT Tests User
A locomotive engine without a train can run at 24mph. The [#permalink] New post 12 Oct 2005, 21:11
00:00

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
A locomotive engine without a train can run at 24mph. The speed diminishes by a quantity which varies as the square root of the number of wagons attached. With 4 wagons the speed is 20mph. The greatest number of wagons that the engine can move is...

A. 195
B. 143
C. 120
D. 24
E. 20
Director
Director
Joined: 21 Aug 2005
Posts: 803
Followers: 2

Kudos [?]: 2 [0], given: 0

GMAT Tests User
 [#permalink] New post 12 Oct 2005, 21:25
B. 143

Let x be the factor by which the speed decreases.
x proportional to sqrt(wagons)
x = Kw, k is a constant and w=wagons.
From the Q, the speed decreases by 4 (x) with 4 wagons,
so 4 = k*sqrt(4) => k=2

If the speed reduces by 24, the engine cannot move. At this condition,
24=2*sqrt(w) => w=144. So when there are 144 wagons, the engine cannot move. With 143 wagons, it can and that is the max.
  [#permalink] 12 Oct 2005, 21:25
    Similar topics Author Replies Last post
Similar
Topics:
 New posts Two trains can run at the speed of 54 km/hr and 36 km/hr rakesh1239 3 18 Feb 2004, 18:45
New posts Without stoppages , a train travels certain distance with an manish8109 9 15 Mar 2005, 12:31
New posts A train travels at an average speed of 90 km/hr without any krisrini 6 27 Apr 2005, 23:53
Popular new posts Books you can not do without: javed 20 24 Feb 2007, 06:29
Popular new posts 1 EXPERTS_POSTS_IN_THIS_TOPIC Two trains run in opposite directions on a circular track. alex1233 13 15 May 2012, 13:47
Display posts from previous: Sort by

A locomotive engine without a train can run at 24mph. The

  Question banks Downloads My Bookmarks Reviews  
Print view
First unread post

Moderators: Bunuel, VeritasPrepKarishma, IanStewart

Search for:


cron

GMAT Club MBA Forum Home| About| Privacy Policy| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group and phpBB SEO

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.

Main navigation

GMAT Resources

Partners

MBA Resources

www.gmac.com|www.mba.com