It is currently 17 Nov 2017, 16:35

### 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

# m07 #24

 new topic post reply Question banks Downloads My Bookmarks Reviews Important topics
Author Message
Director
Joined: 03 Sep 2006
Posts: 865

Kudos [?]: 1104 [0], given: 33

m07 #24 [#permalink]

### Show Tags

02 May 2010, 23:45
A plane can fly from Europe to North America in 12.4 hours, but the return trip only takes 10.26 hours. If the average ground speed of a plane is 700 km/h, what is the approximate distance between Europe and North America?

Is there no faster and shorter approach for this question?

$$V_P = \frac{700 km}{hr}$$.............Absolute Speed of Plane
$$V_W = \frac{X km}{hr}$$...............Absolute Speed of Wind

Distance = D
Therefore:
$$D = (V_P - V_W)*12.4(hr)$$
$$D = (V_P + V_W)*10.26(hr)$$

$$X = \frac{66.1 km}{hr}$$

Thus D = 7860.36 Km

Kudos [?]: 1104 [0], given: 33

Current Student
Joined: 31 Mar 2010
Posts: 167

Kudos [?]: 30 [0], given: 4

Schools: Tuck Class of 2013
Re: m07 #24 [#permalink]

### Show Tags

19 May 2010, 07:26
You can simply imagine this round trip as a single, one way, trip of two equal segments of $$X$$

$$V = \frac{2X}{t1+t2}$$
$$700= \frac{2X}{12,4+10,26}$$

So $$X$$ is around 7700km.

Kudos [?]: 30 [0], given: 4

Re: m07 #24   [#permalink] 19 May 2010, 07:26
Display posts from previous: Sort by

# m07 #24

 new topic post reply Question banks Downloads My Bookmarks Reviews Important topics

Moderator: Bunuel

 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®.