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Director  S
Joined: 17 Dec 2012
Posts: 626
Location: India
A car starts from X and moves towards Y. At the same time  [#permalink]

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Difficulty:   25% (medium)

Question Stats: 78% (02:08) correct 22% (02:06) wrong based on 290 sessions

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A car starts from X and moves towards Y. At the same time another car starts from Y and moves towards X. Both travel at a constant speed and meet after 4 hours. During that time, the faster car traveled 2/3 of the distance XY. How long would it take the slower car to travel the distance XY?

A 6 hours
B. 8 hours
C. 10 hours
D. 12 hours
E. 15 hours

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Intern  Joined: 01 Oct 2013
Posts: 4
WE: Manufacturing and Production (Manufacturing)
Re: A car starts from X and moves towards Y. At the same time  [#permalink]

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Ans is D
This is how
Say Total Dist. XY = 1
Let constant rate of Car X & Car Y be "x" & "y" respectively
Car X distance traveled = 2/3
Time = 4 hrs
Rate of Car X=2/3 div by 4
i.e x = 1/6

When traveling towards each other
Speed = Dist./Time
(x+y) = 1/4
substituting fr "x" in above eqn. we get
y = 1/12
Therefore Time taken to travel Distance XY = 1 div. 1/12
Ans D) 12
Intern  Joined: 12 Sep 2012
Posts: 1
Location: Spain
GPA: 3.95
WE: General Management (Retail)
Re: A car starts from X and moves towards Y. At the same time  [#permalink]

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1
My view on this Question:

If one car travelled 2/3, then the other car must have travelled only 1/3, as they are meeting after 4 hours in a certain point. So:

(1/3)XY= 4*y --> It took the car 4 hours to travel 1/3 of the distance at a constant speed y.

So if we solve this last equation:

XY= 3*4*y= 12*y --> It will take this car 12 hours in total to reach its final destination.

Intern  Joined: 22 Sep 2011
Posts: 8
Concentration: General Management
Re: A car starts from X and moves towards Y. At the same time  [#permalink]

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SravnaTestPrep wrote:
A car starts from X and moves towards Y. At the same time another car starts from Y and moves towards X. Both travel at a constant speed and meet after 4 hours. During that time, the faster car traveled 2/3 of the distance XY. How long would it take the slower car to travel the distance XY?

A 6 hours
B. 8 hours
C. 10 hours
D. 12 hours
E. 15 hours

D --> Take a smart number (as X travel's 2/3 & Y travel's 1/3 of the distance, i took D = 60 since ,we also have to divide 2/3 & 1/3 by 4 i.e time taken by both car)
D = 60 , therefore , X travels 60*2/3 = 40. Now, since t = 4 , therefore X's speed = 40/4 = 10.
Similarly , Y travels 60*1/3 = 20. Since t=4 , Y's Speed = 20/4 = 5
Therefore total time taken by Y is t = D/S = 60/5 = 12hrs
Intern  Joined: 26 Feb 2012
Posts: 14
Concentration: Strategy, International Business
Schools: INSEAD Jan '16
GMAT 3: 640 Q49 V29 Re: A car starts from X and moves towards Y. At the same time  [#permalink]

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SravnaTestPrep wrote:
A car starts from X and moves towards Y. At the same time another car starts from Y and moves towards X. Both travel at a constant speed and meet after 4 hours. During that time, the faster car traveled 2/3 of the distance XY. How long would it take the slower car to travel the distance XY?

A 6 hours
B. 8 hours
C. 10 hours
D. 12 hours
E. 15 hours

Quick and easy:
It is clear that the slower car is the one starting from Y (car B).
If car B spends 4h to complete d/3 of the traject, then it will spend 8h to complete 2d/3 and 12h to make the whole traject (3d/3).

Answer is D, 12h.
Intern  Joined: 14 Dec 2011
Posts: 15
Location: India
Concentration: Technology, Nonprofit
GMAT 1: 640 Q48 V29 GMAT 2: 660 Q45 V35 GPA: 3.5
WE: Information Technology (Computer Software)
Re: A car starts from X and moves towards Y. At the same time  [#permalink]

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1
2
SravnaTestPrep wrote:
A car starts from X and moves towards Y. At the same time another car starts from Y and moves towards X. Both travel at a constant speed and meet after 4 hours. During that time, the faster car traveled 2/3 of the distance XY. How long would it take the slower car to travel the distance XY?

A 6 hours
B. 8 hours
C. 10 hours
D. 12 hours
E. 15 hours

Take XY = 60 km
Car A travelled distance D1 = 2/3*60 = 40km
Car B travelled distance D2 = 1/3*60 = 20km

Car B is slower, travelling 20 km in 4 hours. Car B speed = 20/4 = 5 km/h

Time for Car B to travel whole distance XY = 60 km:
D = S*T
60 = 5*T
T = 60/5 = 12 hours - Answer.

Hope it helps. VP  Joined: 02 Jul 2012
Posts: 1105
Location: India
Concentration: Strategy
GMAT 1: 740 Q49 V42 GPA: 3.8
WE: Engineering (Energy and Utilities)
Re: A car starts from X and moves towards Y. At the same time  [#permalink]

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3
The faster car travels $$\frac{2}{3}$$ of this distance in 4 hours.

The slower car hence travels $$\frac{1}{3}$$ of this distance in 4 hours.

So, to travel the total distance , the slower car would take 4*3 = 12 hours

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Manager  Joined: 13 Aug 2012
Posts: 90
Re: A car starts from X and moves towards Y. At the same time  [#permalink]

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Distance is in the ratio of 2:1 so speed will also be 2:1. Time will be in the ratio of 1:2 because Speed is inversely proportional to time keeping distant constant.
The slowest car's time is $$\frac{1}{3}$$
so $$\frac{1}{3}*x=4$$
$$x=12$$
SVP  Joined: 06 Sep 2013
Posts: 1571
Concentration: Finance
Re: A car starts from X and moves towards Y. At the same time  [#permalink]

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SravnaTestPrep wrote:
A car starts from X and moves towards Y. At the same time another car starts from Y and moves towards X. Both travel at a constant speed and meet after 4 hours. During that time, the faster car traveled 2/3 of the distance XY. How long would it take the slower car to travel the distance XY?

A 6 hours
B. 8 hours
C. 10 hours
D. 12 hours
E. 15 hours

4 (x+y) = d

4x = 2/3d

4y = 1/3d

Therefore, y = d/12

D 12 hours
Manager  Joined: 26 Feb 2012
Posts: 88
Location: India
Concentration: General Management, Finance
WE: Engineering (Telecommunications)
Re: A car starts from X and moves towards Y. At the same time  [#permalink]

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Lets solve it "plug value" ,method as it about fraction....
Say total distance 3 miles so faster car traveled 2 mile and slower one is 1 mile..

So the slower one traveled 1 mile in 4 hour(because they met in 4 hours) that makes the rate 1/4...
Now lets assume T hour required to cover the distance so 1/4*T=3 So T=12 hours(d) ..ans...

Rgds
Prasannajeet
Director  G
Joined: 19 Oct 2013
Posts: 517
Location: Kuwait
GPA: 3.2
WE: Engineering (Real Estate)
Re: A car starts from X and moves towards Y. At the same time  [#permalink]

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If we let the distance = 12

Then the faster car have travelled 8 miles $$= \frac{2}{3}* 12 = 8$$ miles. As a result the slower car have travelled 4 miles.

Since they meet in 4 hours, then Speed of the slow car $$= \frac{4}{4} = 1$$.

On the basis of our assumption that Distance = 12 then Time would be $$= \frac{12}{1} = 12$$ hours Re: A car starts from X and moves towards Y. At the same time   [#permalink] 07 Sep 2018, 18:01
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