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

It is currently 30 Aug 2014, 16:25

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

How much time did it take a certain car to travel 400

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Manager
Manager
User avatar
Joined: 07 Dec 2006
Posts: 169
Followers: 1

Kudos [?]: 20 [0], given: 0

GMAT Tests User
How much time did it take a certain car to travel 400 [#permalink] New post 30 Jan 2008, 07:59
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
How much time did it take a certain car to travel 400 kilometers?

1) The car traveled the first 200 kilometers in 2.5 hours.
2) If the car’s average speed had been 20 kilometers per hours greater than it was, it would have traveled the 400 kilometers in 1 hours less time than it did.
Director
Director
avatar
Joined: 01 Jan 2008
Posts: 629
Followers: 3

Kudos [?]: 130 [0], given: 1

GMAT Tests User
Re: DS . Average speed [#permalink] New post 30 Jan 2008, 08:14
GHIBI wrote:
How much time did it take a certain car to travel 400 kilometers?

1) The car traveled the first 200 kilometers in 2.5 hours.
2) If the car’s average speed had been 20 kilometers per hours greater than it was, it would have traveled the 400 kilometers in 1 hours less time than it did.


1) insufficient - no info about second 200 km
2) sufficient

400/(t-1)-400/t = 20 -> t^2-t-20 = 0 -> t1=-4 (can't be negative), t2 = 5
SVP
SVP
avatar
Joined: 28 Dec 2005
Posts: 1593
Followers: 2

Kudos [?]: 71 [0], given: 2

GMAT Tests User
Re: DS . Average speed [#permalink] New post 30 Jan 2008, 20:11
stat 1 is insuff, we have no idea how long it took for the remaining 200 kms. could be 2 hrs, could be 3, 4, etc...

stat 2 is suff. s+20 = 400/t-1 , s=400/t
Intern
Intern
avatar
Joined: 03 Mar 2007
Posts: 31
Followers: 0

Kudos [?]: 6 [0], given: 0

Re: DS . Average speed [#permalink] New post 31 Jan 2008, 14:10
You know right away to eliminate A and D as 1) only provides information for the first half of the trip

On a question like this I would immediately choose B and not engage in calculation as you have enough information in choice 2) without using any numbers thus saving a lot of time for harder questions
Director
Director
avatar
Joined: 01 May 2007
Posts: 795
Followers: 1

Kudos [?]: 60 [0], given: 0

GMAT Tests User
Re: DS . Average speed [#permalink] New post 31 Jan 2008, 14:39
Would you say this is a harder question?
Re: DS . Average speed   [#permalink] 31 Jan 2008, 14:39
    Similar topics Author Replies Last post
Similar
Topics:
1 How much time did it take a certain car to travel 400 enigma123 4 13 Nov 2011, 01:19
13 Experts publish their posts in the topic How much time did it take a certain car to travel 400 DSGB 9 06 Sep 2010, 11:09
Experts publish their posts in the topic How much time did it take a certain car to travel 400 tarek99 9 25 Jan 2008, 05:56
How much time did it take a certain car to travel 400 km? mexicanhoney 9 29 Nov 2007, 00:13
How much time did it take a certain car to travel 400 kuristar 6 19 Jun 2006, 09:07
Display posts from previous: Sort by

How much time did it take a certain car to travel 400

  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®.