NEW HERE? LEARN MORE
closeclose
Last visit was: 26 Apr 2024, 01:14 It is currently 26 Apr 2024, 01:14
Decision Tracker
My Rewards
New posts
New comers' posts

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.
Go to My Error Log Learn more
Close
Request Expert Reply
Confirm Cancel

How long does it take a particular jet to fly from its base

SORT BY:
Date
Kudos
Tags:
Find Similar Topics 
Show Tags
Hide Tags
avatar
guygmat
Intern
Intern
Joined: 18 Jun 2011
Posts: 42
Own Kudos [?]: 354 [17]
Given Kudos: 0
Send PM
How long does it take a particular jet to fly from its base [#permalink] New post   20 Jun 2011, 21:10
3
Kudos
14
Bookmarks
00:00
A
B
C
D
E

Difficulty:

25% (medium)

Question Stats:

69% (01:02) correct 31% (01:19) wrong based on 328 sessions
Hide Show timer Statistics
How long does it take a particular jet to fly from its base to the Hawaiian Islands?

(1) If the jet’s average speed were 1 1/4 as fast, the flight would take 4 hours.

(2) The jet’s average speed is 500 miles per hour.
ShowHide Answer
Official Answer
A
avatar
gardner
Intern
Intern
Joined: 02 Jun 2011
Posts: 4
Own Kudos [?]: 1 [1]
Given Kudos: 5
Send PM
Re: What a DS!! Awesome question [#permalink] New post   20 Jun 2011, 21:38
1
Kudos
Stmt 1:

time(t)*speed(s) = dist (d)

According to stmt 1, 4*(s+(5/4)s)=d

4*9s/4 = d => 9s = d

therefore t*s=9s => t=9 , Sufficient

Stmt 2: Insufficient

So A

Nice question guygmat!
User avatar
sudhir18n
Current Student
Joined: 26 May 2005
Posts: 356
Own Kudos [?]: 566 [0]
Given Kudos: 13
Send PM
Re: What a DS!! Awesome question [#permalink] New post   20 Jun 2011, 22:27
guygmat wrote:
How long does it take a particular jet to fly from its base to the Hawaiian Islands?

(1) If the jet’s average speed were 1 1/4 as fast, the flight would take 4 hours.

(2) The jet’s average speed is 500 miles per hour.


St:1 tell us if the plane goes 225% of its original speed it will take 4 hrs .
so 100% = 4*225/100 = 4*2.25 = 9

St2: insufficient
User avatar
kp1811
Manager
Manager
Joined: 30 Aug 2009
Posts: 132
Own Kudos [?]: 355 [0]
Given Kudos: 5
Location: India
Concentration: General Management
Send PM
Re: What a DS!! Awesome question [#permalink] New post   20 Jun 2011, 22:56
guygmat wrote:
How long does it take a particular jet to fly from its base to the Hawaiian Islands?

(1) If the jet’s average speed were 1 1/4 as fast, the flight would take 4 hours.

(2) The jet’s average speed is 500 miles per hour.



agree with A...though have a doubt....1 1/4 as fast - this expression means what? - New Avg Speed is 5/4 times the actual Avg Speed or New Avg Speed is [S + (5/4) S] times the actual Avg Speed....I thought it was the 1st case.... :| ...can someone please clarify :oops:
User avatar
L
IanStewart
GMAT Tutor
Joined: 24 Jun 2008
Posts: 4128
Own Kudos [?]: 9245 [1]
Given Kudos: 91
 Q51  V47
Send PM
Re: What a DS!! Awesome question [#permalink] New post   20 Jun 2011, 23:56
1
Kudos
Expert Reply
kp1811 wrote:
guygmat wrote:
How long does it take a particular jet to fly from its base to the Hawaiian Islands?

(1) If the jet’s average speed were 1 1/4 as fast, the flight would take 4 hours.

(2) The jet’s average speed is 500 miles per hour.



agree with A...though have a doubt....1 1/4 as fast - this expression means what? - New Avg Speed is 5/4 times the actual Avg Speed or New Avg Speed is [S + (5/4) S] times the actual Avg Speed....I thought it was the 1st case.... :| ...can someone please clarify :oops:


It should be the first case; statement 1 can be rephrased as: 'If the jet's speed was 5/4 times the current speed'. It's not '9/4', just as when we say one thing is 'twice as fast' as another, we mean that it is 2 times as fast, not 3 times as fast. I don't know why the question uses a mixed number in the question; the GMAT would always write 5/4 and not 1 1/4 in this kind of question.
User avatar
jamifahad
Senior Manager
Senior Manager
Joined: 03 Mar 2010
Posts: 259
Own Kudos [?]: 1372 [0]
Given Kudos: 22
Schools: Simon '16 (M$)
Send PM
Re: What a DS!! Awesome question [#permalink] New post   21 Jun 2011, 00:09
Let the speed be s, distance d and time t.
s=d/t
d=st
Stmt1: New speed s1=5/4 s and time t1=4
s1=d/t1
d=s1*t1
s*t=s1*t1
s*t=5/4s * 4
t=5
Hence it takes 5 hours to fly from base to Hawaii island.
Sufficient.

Stmt2: avg speed=500m/hr. Not sufficient.

OA A.
User avatar
l0rrie
Manager
Manager
Joined: 16 Mar 2011
Posts: 117
Own Kudos [?]: 132 [0]
Given Kudos: 13
Send PM
Re: What a DS!! Awesome question [#permalink] New post   21 Jun 2011, 00:10
A for me too although I messed up the calculations.. grrrr
User avatar
amit2k9
Director
Director
Joined: 08 May 2009
Status:There is always something new !!
Affiliations: PMI,QAI Global,eXampleCG
Posts: 552
Own Kudos [?]: 589 [0]
Given Kudos: 10
Send PM
Re: What a DS!! Awesome question [#permalink] New post   23 Jun 2011, 03:51
a d/(s*5/4) = 4 gives the value for d/s. sufficient.

b no clue about d.not sufficient.

A it is.
User avatar
Spidy001
Senior Manager
Senior Manager
Joined: 01 Feb 2011
Posts: 309
Own Kudos [?]: 324 [0]
Given Kudos: 42
Send PM
Re: What a DS!! Awesome question [#permalink] New post   23 Jun 2011, 23:35
A is sufficient
5v/4 = d/4

v = d/t
B we dont know the distance . so not sufficient

Answer is A.
User avatar
P
push12345
Director
Director
Joined: 02 Oct 2017
Posts: 552
Own Kudos [?]: 481 [0]
Given Kudos: 14
Send PM
How long does it take a particular jet to fly from its base [#permalink] New post   30 Apr 2018, 20:18
Distance remains same throughout journey

If speed becomes 5/4 then time should become 4/5 as distance is same

4/5 corresponds to 4 hrs means in actual it is 5 hours So (4/5)*5=4

Posted from my mobile device
User avatar
bumpbot
Non-Human User
Joined: 09 Sep 2013
Posts: 32679
Own Kudos [?]: 822 [0]
Given Kudos: 0
Send PM
Re: How long does it take a particular jet to fly from its base [#permalink] New post   30 Oct 2023, 01:56
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
GMAT Club Bot
gmatclubot
Re: How long does it take a particular jet to fly from its base [#permalink]
30 Oct 2023, 01:56
Moderator:
Bunuel
Math Expert
92918 posts

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne
Main navigation
GMAT Resources
Partners
MBA Resources
www.gmac.com|www.mba.com | | GMAT Club Rules | Terms and Conditions