It is currently 24 Feb 2018, 19:41

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

Events & Promotions in June
Open Detailed Calendar

Two trains 1& 2 start simultaneously and run on parallel

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

Hide Tags

3 KUDOS received
Intern
Intern
avatar
Joined: 13 May 2013
Posts: 20
Two trains 1& 2 start simultaneously and run on parallel [#permalink]

Show Tags

New post 23 Nov 2013, 03:57
3
This post received
KUDOS
4
This post was
BOOKMARKED
00:00
A
B
C
D
E

Difficulty:

  45% (medium)

Question Stats:

67% (01:34) correct 33% (01:36) wrong based on 220 sessions

HideShow timer Statistics

Two trains 1& 2 start simultaneously and run on parallel tracks between stations A and B .They pass each other after after "t" hours from the start.How much time does the train 2 takes to cover the remaining distance after they pass each other?

1) speed of train 1 is 4 times the speed of train 2.

2) after passing each other train 1 takes 4 hours to complete the remaining distance between the stations.
[Reveal] Spoiler: OA
2 KUDOS received
Verbal Forum Moderator
User avatar
Joined: 10 Oct 2012
Posts: 625
Premium Member
Re: Two trains 1& 2 start simultaneously and run on parallel [#permalink]

Show Tags

New post 24 Nov 2013, 00:27
2
This post received
KUDOS
2
This post was
BOOKMARKED
innocous wrote:
Two trains 1& 2 start simultaneously and run on parallel tracks between stations A and B .They pass each other after after "t" hours from the start.How much time does the train 2 takes to cover the remaining distance after they pass each other?

1) speed of train 1 is 4 times the speed of train 2.

2) after passing each other train 1 takes 4 hours to complete the remaining distance between the stations.


Let the speed of train 1 be\(v_1\) and that of train 2 be \(v_2\); the distance between A and B : 5d


From F.S 1, \(v_1 = 4*v_2.\).Thus,we know that the distance covered by train 1 and train 2 when they meet are in the ratio of 4:1. Hence, the distance covered by train 1 is 4d and that by train 2 is d. Thus time taken by train 2 to cover the remaining distance : \(\frac{4d}{v_2}\) Clearly Insufficient.

F.S 2 states that train 1 takes 4 hours to cover the remaining distance. We have no relation between the two speeds,hence clearly Insufficient.

Taking both together, we know that \(\frac{d}{v_1} = 4 hours \to \frac{d}{4v_2} = 4.\)

Thus, \(\frac{4d}{v_2}\) \(= 4*16 = 64 hours.\)

Sufficient.

C.
_________________

All that is equal and not-Deep Dive In-equality

Hit and Trial for Integral Solutions

Senior Manager
Senior Manager
avatar
S
Joined: 07 Sep 2014
Posts: 482
Concentration: Finance, Marketing
Re: Two trains 1& 2 start simultaneously and run on parallel [#permalink]

Show Tags

New post 30 Aug 2016, 00:59
1
This post was
BOOKMARKED
Two trains 1& 2 start simultaneously and run on parallel tracks between stations A and B .They pass each other after after "t" hours from the start.How much time does the train 2 takes to cover the remaining distance after they pass each other?

1) speed of train 1 is 4 times the speed of train 2.

2) after passing each other train 1 takes 4 hours to complete the remaining distance between the stations.

what train 2 has taken to cover, train 1 will take 1/4 th of it so in 1 hr they will meet.
so before meeting at the somewhere in between A & B, train 2 took 1 hr. that 1 hr will be 15 minute for train 1.
Non-Human User
User avatar
Joined: 09 Sep 2013
Posts: 13760
Premium Member
Re: Two trains 1& 2 start simultaneously and run on parallel [#permalink]

Show Tags

New post 15 Jan 2018, 07:35
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

Re: Two trains 1& 2 start simultaneously and run on parallel   [#permalink] 15 Jan 2018, 07:35
Display posts from previous: Sort by

Two trains 1& 2 start simultaneously and run on parallel

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


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