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

It is currently 17 Sep 2014, 03:50

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

On a certain nonstop trip, Marta averaged x miles per hour

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Intern
Intern
avatar
Joined: 08 Nov 2008
Posts: 38
Followers: 0

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

On a certain nonstop trip, Marta averaged x miles per hour [#permalink] New post 08 Nov 2008, 18:40
On a certain nonstop trip, Marta averaged x miles per hour for 2 hours and y miles per hour for the remaining 3 hours. What was her average speed, in miles per hour, for the entire trip?
(1) 2x + 3y = 280
(2) y = x + 10

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.
Intern
Intern
avatar
Joined: 04 Nov 2008
Posts: 15
Followers: 0

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

Re: speed--29 [#permalink] New post 08 Nov 2008, 18:53
gorden wrote:
On a certain nonstop trip, Marta averaged x miles per hour for 2 hours and y miles per hour for the remaining 3 hours. What was her average speed, in miles per hour, for the entire trip?
(1) 2x + 3y = 280
(2) y = x + 10

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.



the answer is ( A )

let
Sp = is the avg speed
x = is the first speed
y = is the second speed

T1= 2 hours
T2= 3 hours

Distance = D1 + D2

D1 = x*2
D2 = y*3

Total time = 5

Sp = total Distance/ total Time

SP = (D1 + D2) / 5

Sp = (x * 2 + y * 3)/5

now (I) is suffieicent because it give us the nominator
(II) is not sufficent because it give us 2 variable that can not be inserted in our equation


so the answer is A
Re: speed--29   [#permalink] 08 Nov 2008, 18:53
    Similar topics Author Replies Last post
Similar
Topics:
4 Experts publish their posts in the topic Carol started from home on trip averaging 30 miles per hour. cv3t3l1na 5 25 Nov 2012, 04:57
Experts publish their posts in the topic On a certain trip, a cyclist averaged 20 miles per hour for eybrj2 1 31 Mar 2012, 01:24
2 A car averages 40 miles per hour for the first 6 hours of a Summer3 7 14 Mar 2007, 02:05
What was John's average driving speed in miles per hour rahulraao 4 08 Oct 2005, 08:00
The average speed of a car decreased by 3 miles per hour wiseguy 3 08 Jan 2005, 13:37
Display posts from previous: Sort by

On a certain nonstop trip, Marta averaged x miles per hour

  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®.