It is currently 24 Sep 2017, 18:07

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.

Close

Request Expert Reply

Confirm Cancel

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

A certain pilot flew 400 miles to City K at an average speed

  post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
Manager
Manager
avatar
Joined: 03 Oct 2008
Posts: 61

Kudos [?]: 31 [0], given: 0

A certain pilot flew 400 miles to City K at an average speed [#permalink]

Show Tags

New post 09 Oct 2008, 05:20
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

A certain pilot flew 400 miles to City K at an average speed of 350 miles per hour with the wind and made the trip back at an average speed of 250 miles per hour against the wind. Which of the following is closest to the pilot’s average speed, in miles per hour, for the round-trip?

A. 280
B. 290
C. 300
D. 310
E. 320

Kudos [?]: 31 [0], given: 0

1 KUDOS received
Manager
Manager
avatar
Joined: 22 Sep 2008
Posts: 121

Kudos [?]: 48 [1], given: 0

Re: math pilot [#permalink]

Show Tags

New post 09 Oct 2008, 05:43
1
This post received
KUDOS
350 , 250 means wind speed is 50 ,

so pilot normal speed will be 300.

1: 400/350 = 1.142 hrs
2: 400/ 250 = 1.6hrs

Total hrs : 2.742
Total distance: 800

Avg speed: 800/2.742 = 291.xxx

else you can use this formula too.

2xy/x+y = 2*350*250/250+300 = 291.xxx

so answer will be 290.

Thanks

Kudos [?]: 48 [1], given: 0

Re: math pilot   [#permalink] 09 Oct 2008, 05:43
Display posts from previous: Sort by

A certain pilot flew 400 miles to City K at an average speed

  post reply Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne

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®.