GMAT Question of the Day - Daily to your Mailbox; hard ones only

It is currently 20 Nov 2018, 18:45

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 in November
PrevNext
SuMoTuWeThFrSa
28293031123
45678910
11121314151617
18192021222324
2526272829301
Open Detailed Calendar
  • All GMAT Club Tests are Free and open on November 22nd in celebration of Thanksgiving Day!

     November 22, 2018

     November 22, 2018

     10:00 PM PST

     11:00 PM PST

    Mark your calendars - All GMAT Club Tests are free and open November 22nd to celebrate Thanksgiving Day! Access will be available from 0:01 AM to 11:59 PM, Pacific Time (USA)
  • Free lesson on number properties

     November 23, 2018

     November 23, 2018

     10:00 PM PST

     11:00 PM PST

    Practice the one most important Quant section - Integer properties, and rapidly improve your skills.

A certain pilot flew 400 miles to City K at an average speed of 350

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 50711
A certain pilot flew 400 miles to City K at an average speed of 350  [#permalink]

Show Tags

New post 30 Jun 2017, 23:40
00:00
A
B
C
D
E

Difficulty:

  65% (hard)

Question Stats:

64% (01:52) correct 36% (02:18) wrong based on 91 sessions

HideShow timer Statistics

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

_________________

New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
Extra-hard Quant Tests with Brilliant Analytics

Director
Director
User avatar
P
Joined: 18 Aug 2016
Posts: 625
Concentration: Strategy, Technology
GMAT 1: 630 Q47 V29
GMAT 2: 740 Q51 V38
GMAT ToolKit User Premium Member Reviews Badge
Re: A certain pilot flew 400 miles to City K at an average speed of 350  [#permalink]

Show Tags

New post 30 Jun 2017, 23:59
1
Bunuel wrote:
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


Distance traveled = 800

T = (400/350) + (400/250) = (8/7) + (8/5) = 96/35 Hrs

Speed = (800/96)*35 = 3500/12 = ~291

Hence B
_________________

We must try to achieve the best within us


Thanks
Luckisnoexcuse

Manager
Manager
avatar
B
Joined: 27 Mar 2016
Posts: 51
GMAT ToolKit User
Re: A certain pilot flew 400 miles to City K at an average speed of 350  [#permalink]

Show Tags

New post 01 Jul 2017, 01:31
total time taken=400/350+400/250=96/35
total distance traveled = 400+400=800
average speed=800*35/96=291.66
hence B
Intern
Intern
avatar
B
Status: hope for the best, prepare for the worst
Joined: 13 Dec 2015
Posts: 9
Location: Pakistan
Concentration: General Management, International Business
GPA: 3.19
Re: A certain pilot flew 400 miles to City K at an average speed of 350  [#permalink]

Show Tags

New post 31 Oct 2018, 09:49
average speed=2S1*S2/S1+S2
=2*350*250/350+250
=291.6 ANS
GMAT Club Bot
Re: A certain pilot flew 400 miles to City K at an average speed of 350 &nbs [#permalink] 31 Oct 2018, 09:49
Display posts from previous: Sort by

A certain pilot flew 400 miles to City K at an average speed of 350

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


Copyright

GMAT Club MBA Forum Home| About| Terms and Conditions and Privacy Policy| 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®.