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

It is currently 19 Nov 2018, 14:04

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
  • How to QUICKLY Solve GMAT Questions - GMAT Club Chat

     November 20, 2018

     November 20, 2018

     09:00 AM PST

     10:00 AM PST

    The reward for signing up with the registration form and attending the chat is: 6 free examPAL quizzes to practice your new skills after the chat.
  • The winning strategy for 700+ on the GMAT

     November 20, 2018

     November 20, 2018

     06:00 PM EST

     07:00 PM EST

    What people who reach the high 700's do differently? We're going to share insights, tips and strategies from data we collected on over 50,000 students who used examPAL.

Without stoppages a train travels a certain distance with an

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

Hide Tags

Manager
Manager
avatar
Joined: 13 Dec 2009
Posts: 113
Without stoppages a train travels a certain distance with an  [#permalink]

Show Tags

New post Updated on: 09 Oct 2013, 01:16
6
18
00:00
A
B
C
D
E

Difficulty:

  85% (hard)

Question Stats:

50% (01:35) correct 50% (01:45) wrong based on 493 sessions

HideShow timer Statistics

Without stoppages a train travels a certain distance with an average speed of 80 kmph and with stoppages it covers the same distance with an average speed of 60 kmph. What is the time in minutes per hour for which train stops?

A. 15 min/hr
B. 10 min/hr
C. 20 min/hr
D. 25 min/hr
E. None

Originally posted by einstein10 on 17 Apr 2010, 08:05.
Last edited by Bunuel on 09 Oct 2013, 01:16, edited 2 times in total.
Renamed the topic, edited the question and added the OA.
Most Helpful Community Reply
Intern
Intern
avatar
Joined: 15 Jul 2009
Posts: 5
Re: train stoppage time  [#permalink]

Show Tags

New post 17 Apr 2010, 16:57
11
2
A much faster way is to determine how long it would take this train to travel 60 km at 80 km/h. 6/8 = 3/4 = 45 minutes of an hour, this means the train travels for 45 minutes to travel that distance and thus rests for 15 minutes. Just solved this problem in ~ 20 seconds with this method which is well below the 1 minute time constraint.
General Discussion
CEO
CEO
User avatar
Status: Nothing comes easy: neither do I want.
Joined: 12 Oct 2009
Posts: 2601
Location: Malaysia
Concentration: Technology, Entrepreneurship
Schools: ISB '15 (M)
GMAT 1: 670 Q49 V31
GMAT 2: 710 Q50 V35
Reviews Badge
Re: train stoppage time  [#permalink]

Show Tags

New post 17 Apr 2010, 12:04
5
2
Let the distance be 240, t1 = 240/80 = 3 hours
t2 = 240/60 = 4 hours

difference in time = (4-3) = 1 but this is per 4 hours.

so the difference per hour is 1/4 which is 15 mins/hour....
_________________

Fight for your dreams :For all those who fear from Verbal- lets give it a fight

Money Saved is the Money Earned :)

Jo Bole So Nihaal , Sat Shri Akaal

:thanks Support GMAT Club by putting a GMAT Club badge on your blog/Facebook :thanks

GMAT Club Premium Membership - big benefits and savings

Gmat test review :
http://gmatclub.com/forum/670-to-710-a-long-journey-without-destination-still-happy-141642.html

Manager
Manager
avatar
Joined: 13 Dec 2009
Posts: 113
Re: train stoppage time  [#permalink]

Show Tags

New post 17 Apr 2010, 17:08
1
1
Zehnze wrote:
A much faster way is to determine how long it would take this train to travel 60 km at 80 km/h. 6/8 = 3/4 = 45 minutes of an hour, this means the train travels for 45 minutes to travel that distance and thus rests for 15 minutes. Just solved this problem in ~ 20 seconds with this method which is well below the 1 minute time constraint.

thank you, your method is really good, just need to strike at right time.
Manager
Manager
User avatar
Status: folding sleeves up
Joined: 26 Apr 2013
Posts: 139
Location: India
Concentration: Finance, Strategy
GMAT 1: 530 Q39 V23
GMAT 2: 560 Q42 V26
GPA: 3.5
WE: Consulting (Computer Hardware)
Re: train stoppage time  [#permalink]

Show Tags

New post 08 Oct 2013, 12:02
4
sol:

80t = 60 (t+s)

t= usual time
S= stop time
t=3s

question wants us to find how much time per hour

t+s= 1 hr
4s= 60 min
s= 15 min
SVP
SVP
User avatar
Joined: 06 Sep 2013
Posts: 1744
Concentration: Finance
GMAT ToolKit User
Re: Without stoppages a train travels a certain distance with an  [#permalink]

Show Tags

New post 31 Dec 2013, 07:45
4
einstein10 wrote:
Without stoppages a train travels a certain distance with an average speed of 80 kmph and with stoppages it covers the same distance with an average speed of 60 kmph. What is the time in minutes per hour for which train stops?

A. 15 min/hr
B. 10 min/hr
C. 20 min/hr
D. 25 min/hr
E. None


Pick a smart number for the distance. lets say LCM 240

Without = 240/80 = 3 hours
With = 240/60= 4 hours

So in a trip of 4 hours, 1 hour is spent in stoppages

Hence, 60/4 = 15 min/hr on stoppages

Hope its clear
Cheers!

J :)
Manager
Manager
avatar
Joined: 13 Sep 2014
Posts: 88
WE: Engineering (Consulting)
Re: Without stoppages a train travels a certain distance with an  [#permalink]

Show Tags

New post 21 Sep 2014, 03:17
1
einstein10 wrote:
Without stoppages a train travels a certain distance with an average speed of 80 kmph and with stoppages it covers the same distance with an average speed of 60 kmph. What is the time in minutes per hour for which train stops?

A. 15 min/hr
B. 10 min/hr
C. 20 min/hr
D. 25 min/hr
E. None



1) there is a difference of 20kmph = 1/4th of 80kmph
2) that means train stops for 1/4th of an hour = 15 m/hr
VP
VP
avatar
P
Joined: 07 Dec 2014
Posts: 1118
Without stoppages a train travels a certain distance with an  [#permalink]

Show Tags

New post Updated on: 30 Sep 2017, 20:08
Without stoppages a train travels a certain distance with an average speed of 80 kmph and with stoppages it covers the same distance with an average speed of 60 kmph. What is the time in minutes per hour for which train stops?

A. 15 min/hr
B. 10 min/hr
C. 20 min/hr
D. 25 min/hr
E. None

let distance=80 k
stopping train's running time at 80 kmph=1 hour
let s=stopping time
80 k/(1+s) hr=60 kmph
s=1/3 hours
total time=1+1/3=4/3 hr
(1/3)/(4/3) hrs=1/4=15 minutes per hr stopping time
A

Originally posted by gracie on 01 Nov 2015, 10:15.
Last edited by gracie on 30 Sep 2017, 20:08, edited 2 times in total.
Senior Manager
Senior Manager
avatar
G
Joined: 09 Feb 2015
Posts: 357
Location: India
Concentration: Social Entrepreneurship, General Management
GMAT 1: 690 Q49 V34
GMAT 2: 720 Q49 V39
GPA: 2.8
Premium Member Reviews Badge CAT Tests
Re: Without stoppages a train travels a certain distance with an  [#permalink]

Show Tags

New post 27 Nov 2015, 22:26
1
the train is travelling 20 kms less an hour..
20kms it could have covered in 20/80=1/4th hour or 15 mins
hence the train stops for 15 mins evry hour.
Director
Director
User avatar
S
Joined: 17 Dec 2012
Posts: 629
Location: India
Re: Without stoppages a train travels a certain distance with an  [#permalink]

Show Tags

New post 29 Jun 2017, 21:54
einstein10 wrote:
Without stoppages a train travels a certain distance with an average speed of 80 kmph and with stoppages it covers the same distance with an average speed of 60 kmph. What is the time in minutes per hour for which train stops?

A. 15 min/hr
B. 10 min/hr
C. 20 min/hr
D. 25 min/hr
E. None

The average speed is reduced by 1/4 th. So actual time traveled per hour is reduced by 1/4th. So the train stops 15 min/hr.
_________________

Srinivasan Vaidyaraman
Sravna Holistic Solutions
http://www.sravnatestprep.com

Holistic and Systematic Approach

Intern
Intern
avatar
Joined: 28 Jun 2017
Posts: 7
Re: Without stoppages a train travels a certain distance with an  [#permalink]

Show Tags

New post 30 Jun 2017, 09:19
4
Actual speed of train = 80km/hr. On stopping this reduces to 60km/hr. That is it loses 20km worth of time. For traveling 20km the train takes 20/80 hrs = 15 minutes.
Board of Directors
User avatar
P
Status: QA & VA Forum Moderator
Joined: 11 Jun 2011
Posts: 4230
Location: India
GPA: 3.5
WE: Business Development (Commercial Banking)
GMAT ToolKit User Premium Member
Re: Without stoppages a train travels a certain distance with an  [#permalink]

Show Tags

New post 30 Jun 2017, 10:23
einstein10 wrote:
Without stoppages a train travels a certain distance with an average speed of 80 kmph and with stoppages it covers the same distance with an average speed of 60 kmph. What is the time in minutes per hour for which train stops?

A. 15 min/hr
B. 10 min/hr
C. 20 min/hr
D. 25 min/hr
E. None

Using formula

Time = Diff of Speed/Speed with stoppage*60

Or, Time = \(\frac{80 - 60}{80}*60\)

Or, Time = 15 Min/Hr

Thus, answer must be (A) 15

_________________

Thanks and Regards

Abhishek....

PLEASE FOLLOW THE RULES FOR POSTING IN QA AND VA FORUM AND USE SEARCH FUNCTION BEFORE POSTING NEW QUESTIONS

How to use Search Function in GMAT Club | Rules for Posting in QA forum | Writing Mathematical Formulas |Rules for Posting in VA forum | Request Expert's Reply ( VA Forum Only )

VP
VP
avatar
P
Joined: 07 Dec 2014
Posts: 1118
Without stoppages a train travels a certain distance with an  [#permalink]

Show Tags

New post 30 Jun 2017, 12:15
einstein10 wrote:
Without stoppages a train travels a certain distance with an average speed of 80 kmph and with stoppages it covers the same distance with an average speed of 60 kmph. What is the time in minutes per hour for which train stops?

A. 15 min/hr
B. 10 min/hr
C. 20 min/hr
D. 25 min/hr
E. None


let distance=80 k
80 k/80 kph=1 hr running time
80 k/60 kph=4/3 hr total time
1:4/3=3/4 ratio of running time to total time
thus, ratio of stopping time to total time=1/4
60 min/4=15 min
15 min/hr
A
Intern
Intern
avatar
Joined: 30 Sep 2017
Posts: 1
Re: Without stoppages a train travels a certain distance with an  [#permalink]

Show Tags

New post 30 Sep 2017, 09:46
Here is a short trick or formula for this type of questions
Time= difference in speed/speed without stoppage
So from the question
Difference in speed=80-60=20
Speed without stoppage =80
Put the value
T= 20/80= 1/4 hr
Now 1/4*60
=15 min/hr

Posted from my mobile device
Non-Human User
User avatar
Joined: 09 Sep 2013
Posts: 8846
Premium Member
Re: Without stoppages a train travels a certain distance with an  [#permalink]

Show Tags

New post 03 Nov 2018, 09:25
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 Books | GMAT Club Tests | Best Prices on GMAT Courses | GMAT Mobile App | Math Resources | Verbal Resources

GMAT Club Bot
Re: Without stoppages a train travels a certain distance with an &nbs [#permalink] 03 Nov 2018, 09:25
Display posts from previous: Sort by

Without stoppages a train travels a certain distance with an

  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®.