Find all School-related info fast with the new School-Specific MBA Forum

It is currently 20 Sep 2014, 12:04

Close

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

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

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Senior Manager
Senior Manager
User avatar
Joined: 20 Dec 2004
Posts: 258
Followers: 6

Kudos [?]: 67 [0], given: 0

GMAT Tests User
A locomotive engine without a train can run at 24mph. The [#permalink] New post 12 Oct 2005, 20:11
00:00
A
B
C
D
E

Difficulty:

(N/A)

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
avatar
Joined: 21 Aug 2005
Posts: 795
Followers: 2

Kudos [?]: 5 [0], given: 0

GMAT Tests User
 [#permalink] New post 12 Oct 2005, 20:25
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, 20:25
    Similar topics Author Replies Last post
Similar
Topics:
9 Experts publish their posts in the topic Two trains run in opposite directions on a circular track. alex1233 20 15 May 2012, 12:47
8 Without stoppages a train travels a certain distance with an einstein10 5 17 Apr 2010, 08:05
Books you can not do without: javed 20 24 Feb 2007, 05:29
A train travels at an average speed of 90 km/hr without any krisrini 6 27 Apr 2005, 22:53
Without stoppages , a train travels certain distance with an manish8109 9 15 Mar 2005, 11:31
Display posts from previous: Sort by

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

  Question banks Downloads My Bookmarks Reviews Important topics  


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®.