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

It is currently 19 May 2013, 13:20
Customize  |  Hide

Search
Register
New posts
Unanswered

A plane flying against the wind covers a 900 kilometer route

  Question banks Downloads My Bookmarks Reviews  
  Oldest Best Reply
Search for:
 
Print view
First unread post
Author Message
TAGS:
Manager
Manager
Joined: 12 Feb 2006
Posts: 119
Followers: 1

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

GMAT Tests User
A plane flying against the wind covers a 900 kilometer route [#permalink] New post 28 Feb 2007, 03:00
A plane flying against the wind covers a 900 kilometer route in 2 hours. The same plane flying with the wind covers the same 900 kilometer route in 1.8 hours. If the speed of the wind is constant what is the speed of the wind?

18 KMH
20 KMH
22 KMH
25 KMH
27 KMH
SVP
SVP
User avatar
Joined: 01 May 2006
Posts: 1837
Followers: 8

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

GMAT Tests User
 [#permalink] New post 28 Feb 2007, 03:40
(D) for me :)

Let set those variables:
o V : the speed of the aircraft in KM/H when there is no wind
o v : the speed of the wind.

Then, we have those equations from the 2 trips
o 900/2 = V-v (1)
o 900/1,8 = V+v (2)

Finally,
(2)-(1) <=> 900*(1/1,8 - 1/2) = 2*v
<=> v = 900 / 2 * (10/18 - 9/18) = 900/2 * 1/18 = 100/4 = 25
VP
VP
User avatar
Joined: 09 Jan 2007
Posts: 1046
Location: New York, NY
Schools: Chicago Booth Class of 2010
Followers: 9

Kudos [?]: 156 [0], given: 3

GMAT Tests User
Re: Help with a Rate Question [#permalink] New post 28 Feb 2007, 03:43
bz9 wrote:
A plane flying against the wind covers a 900 kilometer route in 2 hours. The same plane flying with the wind covers the same 900 kilometer route in 1.8 hours. If the speed of the wind is constant what is the speed of the wind?

18 KMH
20 KMH
22 KMH
25 KMH
27 KMH


Airplane Speed=A
Wind Speed=W

A-W=900/2=450 Km/h
A+W=900/1.8=500Km/h

Solving for W=25Km/h (D)
Re: Help with a Rate Question   [#permalink] 28 Feb 2007, 03:43
    Similar topics Author Replies Last post
Similar
Topics:
 New posts Plane X is flying at an altitude of 25000 sq. feet and Plane mistdew 5 16 Aug 2003, 02:10
New posts The speed of a plane is 120mi/hr in a calm. With the wind it redneckboy 5 25 Sep 2005, 21:17
New posts Yesterday it took a certain plane 3 hrs. to fly from City A bewakoof 3 25 Jul 2007, 22:04
New posts A plane flying from Europe to South America takes 12.4 bmwhype2 1 18 Nov 2007, 17:06
New posts 3 EXPERTS_POSTS_IN_THIS_TOPIC Airplane A flew against a headwind a distance of 900 miles metallicafan 4 03 May 2012, 16:06
Display posts from previous: Sort by

A plane flying against the wind covers a 900 kilometer route

  Question banks Downloads My Bookmarks Reviews  
Print view
First unread post

Moderators: Bunuel, VeritasPrepKarishma

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