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

It is currently 13 Nov 2018, 12:32

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
  • Essential GMAT Time-Management Hacks

     November 14, 2018

     November 14, 2018

     07:00 PM PST

     08:00 PM PST

    Join the webinar and learn time-management tactics that will guarantee you answer all questions, in all sections, on time. Save your spot today! Nov. 14th at 7 PM PST
  • $450 Tuition Credit & Official CAT Packs FREE

     November 15, 2018

     November 15, 2018

     10:00 PM MST

     11:00 PM MST

    EMPOWERgmat is giving away the complete Official GMAT Exam Pack collection worth $100 with the 3 Month Pack ($299)

Jane goes the trip of 40miles, the first 20 miles at 60 miles per hour

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

Hide Tags

Math Revolution GMAT Instructor
User avatar
V
Joined: 16 Aug 2015
Posts: 6499
GMAT 1: 760 Q51 V42
GPA: 3.82
Premium Member
Jane goes the trip of 40miles, the first 20 miles at 60 miles per hour  [#permalink]

Show Tags

New post 11 May 2016, 19:13
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

84% (01:06) correct 16% (01:38) wrong based on 139 sessions

HideShow timer Statistics

Jane goes the trip of 40miles, the first 20 miles at 60 miles per hour and the rest 20 miles at 30 miles per hour, what is the average speed of the entire trip?
A. 30miles/1hr
B. 36miels/1hr
C. 40miles/1hr
D. 42miels/1hr
E. 45miles/1hr


* A solution will be posted in two days.

_________________

MathRevolution: Finish GMAT Quant Section with 10 minutes to spare
The one-and-only World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy.
"Only $99 for 3 month Online Course"
"Free Resources-30 day online access & Diagnostic Test"
"Unlimited Access to over 120 free video lessons - try it yourself"

Math Expert
User avatar
V
Joined: 02 Aug 2009
Posts: 7025
Re: Jane goes the trip of 40miles, the first 20 miles at 60 miles per hour  [#permalink]

Show Tags

New post 12 May 2016, 08:03
MathRevolution wrote:
Jane goes the trip of 40miles, the first 20 miles at 60 miles per hour and the rest 20 miles at 30 miles per hour, what is the average speed of the entire trip?
A. 30miles/1hr
B. 36miels/1hr
C. 40miles/1hr
D. 42miels/1hr
E. 45miles/1hr


* A solution will be posted in two days.


Since the distance travelled is same...
avg speed =\(\frac{2ab}{(a+b)}= \frac{2*60*30}{(30+60)} = 40\)
C
_________________

1) Absolute modulus : http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
2)Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html
3) effects of arithmetic operations : https://gmatclub.com/forum/effects-of-arithmetic-operations-on-fractions-269413.html


GMAT online Tutor

Current Student
User avatar
Joined: 18 Oct 2014
Posts: 855
Location: United States
GMAT 1: 660 Q49 V31
GPA: 3.98
GMAT ToolKit User
Re: Jane goes the trip of 40miles, the first 20 miles at 60 miles per hour  [#permalink]

Show Tags

New post 12 May 2016, 08:42
Since the distance traveled is same, we can apply direct formula= 2XS1XS2/S1+S2

2X60X30/90= 40 'C' is the answer
_________________

I welcome critical analysis of my post!! That will help me reach 700+

Math Revolution GMAT Instructor
User avatar
V
Joined: 16 Aug 2015
Posts: 6499
GMAT 1: 760 Q51 V42
GPA: 3.82
Premium Member
Re: Jane goes the trip of 40miles, the first 20 miles at 60 miles per hour  [#permalink]

Show Tags

New post 14 May 2016, 01:49
Average speed = the total distance / the total time. The first 20 miles took 1/3 hr and the rest 20 miles took 2/3 hr. Then, the average speed=(20 miles + 20 miles)/(1/3 + 2/3) hr= 40 miles/1hr. Hence, the correct answer is C.
_________________

MathRevolution: Finish GMAT Quant Section with 10 minutes to spare
The one-and-only World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy.
"Only $99 for 3 month Online Course"
"Free Resources-30 day online access & Diagnostic Test"
"Unlimited Access to over 120 free video lessons - try it yourself"

Intern
Intern
avatar
Joined: 25 Jun 2015
Posts: 8
Location: Portugal
GMAT 1: 370 Q37 V37
GPA: 2.92
GMAT ToolKit User
Re: Jane goes the trip of 40miles, the first 20 miles at 60 miles per hour  [#permalink]

Show Tags

New post 05 Aug 2016, 04:21
I did like this: 20/60 + 20/30 = 6/6 = 1
Intern
Intern
avatar
Joined: 06 Dec 2017
Posts: 1
Re: Jane goes the trip of 40miles, the first 20 miles at 60 miles per hour  [#permalink]

Show Tags

New post 15 Dec 2017, 01:00
Found this to be the most simpler method
20miles/60+20miles/30=40miles/x
or, 20/60+40/60= 40/x
or, 1=40/x
or, x=40
GMAT Club Bot
Re: Jane goes the trip of 40miles, the first 20 miles at 60 miles per hour &nbs [#permalink] 15 Dec 2017, 01:00
Display posts from previous: Sort by

Jane goes the trip of 40miles, the first 20 miles at 60 miles per hour

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


cron
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®.