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# Stations X and Y are connected by two separate, straight,

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SVP
Joined: 06 Sep 2013
Posts: 1660
Concentration: Finance
Re: Stations X and Y are connected by two separate, straight,  [#permalink]

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31 Dec 2013, 08:05
tenaman10 wrote:
Stations X and Y are connected by two separate, straight, parallel rail lines that are 250 miles long. Train P and train Q simultaneously left Station X and Station Y, respectively, and each train traveled to the other’s point of departure. The two trains passed each other after traveling for 2 hours. When the two trains passed, which train was nearer to its destination?

(1) At the time when the two trains passed, train P had averaged a speed of 70 miles per hour.
(2) Train Q averaged a speed of 55 miles per hour for the entire trip.

Clear A, from question stem, one gets the following

(P+Q)(2) = 250

(P+Q) = 125

Statement 1

P= 70 --> Q= 55

Suff

Statement 2

Not suff

Hence A is the correct answer

Hope it helps!
Cheers!

J
Manager
Joined: 20 Oct 2013
Posts: 54
Re: Stations X and Y are connected by two separate, straight,  [#permalink]

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05 May 2014, 23:28
HI bunnel

Please explain once the concept of average speed... as in when we need the average speed of entire trip and when we need average speed at the time of meeting
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Re: Stations X and Y are connected by two separate, straight,  [#permalink]

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06 May 2014, 03:21
nandinigaur wrote:
HI bunnel

Please explain once the concept of average speed... as in when we need the average speed of entire trip and when we need average speed at the time of meeting

Not sure I follow... Generally (average speed) = (total distance)/(total time) ...

All DS Distance/Rate Problems to practice: search.php?search_id=tag&tag_id=44
All PS Distance/Rate Problems to practice: search.php?search_id=tag&tag_id=64

Hope this helps.
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Re: Stations X and Y are connected by two separate, straight,  [#permalink]

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20 Jan 2015, 10:32
Stations X and Y are connected by two separate, straight, parallel rail lines that are 250 miles long. Train P and train Q simultaneously left Station X and Station Y, respectively, and each train traveled to the other’s point of departure. The two trains passed each other after traveling for 2 hours. When the two trains passed, which train was nearer to its destination?

(1) At the time when the two trains passed, train P had averaged a speed of 70 miles per hour.
(2) Train Q averaged a speed of 55 miles per hour for the entire trip

SOLUTION:

D = 250 miles
P and Q travel 2 hrs each before they meet

From (1): P speed = 70 mph i.e. in 2 hrs it covers 140 miles
Therefore, Q must have traveled = 110 miles ---- SUFFICIENT

From (2): Q speed for ENTIRE trip = 55 mph ---- Clearly INSUFFICIENT

Director
Joined: 04 Jun 2016
Posts: 563
GMAT 1: 750 Q49 V43
Stations X and Y are connected by two separate, straight,  [#permalink]

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01 Aug 2016, 03:56
Stations X and Y are connected by two separate, straight, parallel rail lines that are 250 miles long. Train P and train Q simultaneously left Station X and Station Y, respectively, and each train traveled to the other’s point of departure. The two trains passed each other after traveling for 2 hours. When the two trains passed, which train was nearer to its destination?

(1) At the time when the two trains passed, train P had averaged a speed of 70 miles per hour.
Train P has been running for 2 hours with an average speed of 70 miles per hour so it has covered 140 km .
The total distance is 250; so P was 250-140= 90 miles away from its destination .
We can use logic to see that since the train are crossing each other then train Q must also travelled 90 kilometres and thus it was 250-90 = 160 km away from its destination
Train P was closer
SUFFICIENT

(2) Train Q averaged a speed of 55 miles per hour for the entire trip.
Well the speed for first hour can vary from the second's hour's speed and so on.
We don know at what speed train Q travelled for the first 2 hours so we cannot figure out its distance.
INSUFFICIENT

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Intern
Joined: 06 Dec 2016
Posts: 2
Stations X and Y are connected by two separate, straight,  [#permalink]

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08 Dec 2016, 00:09
I don't know, but this one seems actually quite easy to me. Statement 1 says that at the time when the two trains passed, train P had average speed of 70 mph, that is after traveling 2 hours, which makes it 140. The rail lines are parallel and 250 long, meaning train P is 110 miles from its destination (250-140), while train Q was 140 miles from its destination. Hence, statement 1 is sufficient. Hope it is clear.
Intern
Joined: 11 Oct 2016
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GMAT 1: 680 Q48 V35
GPA: 3.61
Re: Stations X and Y are connected by two separate, straight,  [#permalink]

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22 Aug 2018, 09:57
Intern
Joined: 05 Jun 2018
Posts: 6
Re: Stations X and Y are connected by two separate, straight,  [#permalink]

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04 Oct 2018, 23:04
IMO A. The catch in the question is 'for the entire trip' in statement B. Thats why ppl say GMAT is a tricky exam. So much attention required during exam.
Re: Stations X and Y are connected by two separate, straight,   [#permalink] 04 Oct 2018, 23:04

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