Average speed : Quant Question Archive [LOCKED]
Check GMAT Club Decision Tracker for the Latest School Decision Releases http://gmatclub.com/AppTrack

 It is currently 18 Jan 2017, 18:35

### 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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# Average speed

 post reply Question banks Downloads My Bookmarks Reviews Important topics
Author Message
Senior Manager
Joined: 10 Mar 2008
Posts: 371
Followers: 5

Kudos [?]: 259 [0], given: 0

Average speed [#permalink]

### Show Tags

14 Feb 2009, 14:00
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

2 dogsleds raced across a 300 mile course. Team A finished the course in 3 fewer hours than did Team B. If Team A's average speed was 5 miles per hour greater than that of Team B, what was Team B's average speed in miles per hour?

(a) 12
(b) 15
(c) 18
(d) 20
(e) 25
SVP
Joined: 29 Aug 2007
Posts: 2492
Followers: 67

Kudos [?]: 734 [1] , given: 19

Re: Average speed [#permalink]

### Show Tags

14 Feb 2009, 14:59
1
This post received
KUDOS
vksunder wrote:
2 dogsleds raced across a 300 mile course. Team A finished the course in 3 fewer hours than did Team B. If Team A's average speed was 5 miles per hour greater than that of Team B, what was Team B's average speed in miles per hour?

(a) 12
(b) 15
(c) 18
(d) 20
(e) 25

Time for A = x
Time for B = x+3

Speed for A = y + 5
Speed for B = y

x(y+5) = (x+3)y
x = 3y/5
x(y+5) = 300
(3y/5) (y+5) = 300
y^2 + 5y - 500 = 0
y = 20
_________________

Verbal: http://gmatclub.com/forum/new-to-the-verbal-forum-please-read-this-first-77546.html
Math: http://gmatclub.com/forum/new-to-the-math-forum-please-read-this-first-77764.html
Gmat: http://gmatclub.com/forum/everything-you-need-to-prepare-for-the-gmat-revised-77983.html

GT

Current Student
Joined: 28 Dec 2004
Posts: 3384
Location: New York City
Schools: Wharton'11 HBS'12
Followers: 15

Kudos [?]: 282 [0], given: 2

Re: Average speed [#permalink]

### Show Tags

15 Feb 2009, 19:20
i get 20 as well

same work as GT except, when i got to the quadratic, i just plugged in ans choice..20 seemed the right number since i had 20*25=500
Re: Average speed   [#permalink] 15 Feb 2009, 19:20
Display posts from previous: Sort by

# Average speed

 post reply Question banks Downloads My Bookmarks Reviews Important topics

 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®.