It is currently 18 Mar 2018, 12:29

### 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

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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# Without stoppages a train travels a certain distance with an

Author Message
TAGS:

### Hide Tags

Manager
Joined: 13 Dec 2009
Posts: 124
Without stoppages a train travels a certain distance with an [#permalink]

### Show Tags

17 Apr 2010, 09:05
5
KUDOS
13
This post was
BOOKMARKED
00:00

Difficulty:

85% (hard)

Question Stats:

51% (01:36) correct 49% (01:44) wrong based on 453 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
[Reveal] Spoiler: OA

Last edited by Bunuel on 09 Oct 2013, 02:16, edited 2 times in total.
Renamed the topic, edited the question and added the OA.
CEO
Status: Nothing comes easy: neither do I want.
Joined: 12 Oct 2009
Posts: 2700
Location: Malaysia
Concentration: Technology, Entrepreneurship
Schools: ISB '15 (M)
GMAT 1: 670 Q49 V31
GMAT 2: 710 Q50 V35

### Show Tags

17 Apr 2010, 13:04
3
KUDOS
2
This post was
BOOKMARKED
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

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

Intern
Joined: 15 Jul 2009
Posts: 5

### Show Tags

17 Apr 2010, 17:57
7
KUDOS
4
This post was
BOOKMARKED
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.
Manager
Joined: 13 Dec 2009
Posts: 124

### Show Tags

17 Apr 2010, 18:08
1
This post was
BOOKMARKED
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
Status: folding sleeves up
Joined: 26 Apr 2013
Posts: 152
Location: India
Concentration: Finance, Strategy
GMAT 1: 530 Q39 V23
GMAT 2: 560 Q42 V26
GPA: 3.5
WE: Consulting (Computer Hardware)

### Show Tags

08 Oct 2013, 13:02
3
KUDOS
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
Current Student
Joined: 06 Sep 2013
Posts: 1949
Concentration: Finance
Re: Without stoppages a train travels a certain distance with an [#permalink]

### Show Tags

31 Dec 2013, 08:45
4
KUDOS
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
Joined: 14 Sep 2014
Posts: 94
WE: Engineering (Consulting)
Re: Without stoppages a train travels a certain distance with an [#permalink]

### Show Tags

21 Sep 2014, 04:17
1
KUDOS
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
Director
Joined: 07 Dec 2014
Posts: 923
Without stoppages a train travels a certain distance with an [#permalink]

### Show Tags

01 Nov 2015, 11:15
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

Last edited by gracie on 30 Sep 2017, 21:08, edited 2 times in total.
Senior Manager
Joined: 09 Feb 2015
Posts: 387
Location: India
Concentration: Social Entrepreneurship, General Management
GMAT 1: 690 Q49 V34
GMAT 2: 720 Q49 V39
GPA: 2.8
Re: Without stoppages a train travels a certain distance with an [#permalink]

### Show Tags

27 Nov 2015, 23:26
1
This post was
BOOKMARKED
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
Joined: 17 Dec 2012
Posts: 635
Location: India
Re: Without stoppages a train travels a certain distance with an [#permalink]

### Show Tags

29 Jun 2017, 22:54
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
http://www.sravnatestprep.com/courses.php

Standardized Approaches

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

### Show Tags

30 Jun 2017, 10:19
4
KUDOS
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
Status: QA & VA Forum Moderator
Joined: 11 Jun 2011
Posts: 3353
Location: India
GPA: 3.5
Re: Without stoppages a train travels a certain distance with an [#permalink]

### Show Tags

30 Jun 2017, 11:23
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 )

Director
Joined: 07 Dec 2014
Posts: 923
Without stoppages a train travels a certain distance with an [#permalink]

### Show Tags

30 Jun 2017, 13:15
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
Joined: 30 Sep 2017
Posts: 1
Re: Without stoppages a train travels a certain distance with an [#permalink]

### Show Tags

30 Sep 2017, 10:46
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
Re: Without stoppages a train travels a certain distance with an   [#permalink] 30 Sep 2017, 10:46
Display posts from previous: Sort by