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

It is currently 23 Nov 2014, 21:46

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

m08q34

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
Intern
Intern
avatar
Joined: 03 Sep 2008
Posts: 6
Followers: 2

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

m08q34 [#permalink] New post 12 Dec 2010, 03:58
A plane takes off from a hill at 750 meters above sea level and lands some time later in a town located at 50 meters below sea level. During the first part of its flight, the plane gained height at a rate of 50 meters per minute but then it started to descend at a rate of 20 meters per minute. The duration of the first part of the flight was what percent of the total flight time?

1.The duration of the descent is known.
2.The total flight time is known.

This qn is already discussed . But I still dont undesrtand the logic.

I have translated the qn to a figure(attached with this prob),as per my understanding.
Attachment:
m08q34.gif
m08q34.gif [ 4.11 KiB | Viewed 682 times ]

b = distance travelled while gaining height at a rate of 50mps
c+d= distance travelled while descending at a rate of 20mps
Qn asks for T(b)/T(c+d)
where Tb= Time to ascent ;ie time to travel distance of b.
T=Total time.time to cover b+c+d

Is there anything wrong in my understanding ? I am not sure how to proceed further .
Intern
Intern
avatar
Joined: 03 Sep 2008
Posts: 6
Followers: 2

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

Re: m08q34 [#permalink] New post 12 Dec 2010, 19:02
No response even after a day !!
Wonder ..is the qn so difficult or is the qn so simple ..that nobody is answering !
1 KUDOS received
Manager
Manager
avatar
Joined: 25 Jun 2010
Posts: 91
Followers: 1

Kudos [?]: 23 [1] , given: 0

GMAT ToolKit User
Re: m08q34 [#permalink] New post 12 Dec 2010, 20:02
1
This post received
KUDOS
Don't bother about distance traveled towards x-axis. Consider only the y-axis, i.e. going up and coming down. That is what is discussed and the rate (50 and 20) mentioned is in terms of height gained or lost.


So, say if t1 is time for going up and t2 is time taken while going down :

20t2 = 750+50t1-(-50)
=> 20 t2 = 800 + 50 t1 ---1

We need to find : t1/(t1+t2) * 100

Statement 1: If t2 is known, we can calculate t1, hence the % can be calculated - Sufficient

Statement 2: If (t1+t2) is known, say t1+t2 = K (some constant) --- 2

Then we have two independent equations in terms of t1 and t2. So, again we can calculate the % - Sufficient

Hence the answer should be D.

Hope, it helps.
Intern
Intern
avatar
Joined: 03 Sep 2008
Posts: 6
Followers: 2

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

Re: m08q34 [#permalink] New post 13 Dec 2010, 04:22
Thanks ! I have spent more than 1 hour ! Just one word "height" made all the difference !
Re: m08q34   [#permalink] 13 Dec 2010, 04:22
    Similar topics Author Replies Last post
Similar
Topics:
14 Experts publish their posts in the topic ds rate (m08q34) bmwhype2 20 28 Dec 2007, 11:06
Display posts from previous: Sort by

m08q34

  Question banks Downloads My Bookmarks Reviews Important topics  

Moderators: WoundedTiger, Bunuel



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®.