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Hayden began walking from F to G, a distance of 40 miles

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Hayden began walking from F to G, a distance of 40 miles [#permalink] New post 04 Mar 2012, 12:14
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Hayden began walking from F to G, a distance of 40 miles, at the same time Ava began walking from G to F on the same road. If Hayden’s walking speed was x miles per hour and Ava’s was y miles per hour, how many miles away from F were they, in terms of x and y, when they met?

(A) \frac{40(x-y)}{x+y}
(B) 40x-\frac{y}{x+y}
(C) \frac{(x-y)}{x+y}
(D) \frac{40y}{x+y}
(E) \frac{40x}{x+y}

[Reveal] Spoiler:
Ok. This is how I am solving this.

Hayden's speed = x miles/hr
Ava speed = y miles/hr

Relative speed = (x+y) miles/hr as they are travelling in opposite direction (F to G and G to F)

Total time taken = \frac{40}{x+y} ---------------------------[D = Speed/Time]

So Hayden will take = \frac{40x}{x+y}-------------------------[I have guessed this and this is the right answer]. But not 100% why though? Can someone please help?
[Reveal] Spoiler: OA

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Last edited by Bunuel on 08 Sep 2013, 04:06, edited 1 time in total.
Edited the question.
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Re: Hayden & Eva [#permalink] New post 04 Mar 2012, 13:21
Total time(T) taken is the time for Hayden and Eva to meet. Now you know that Hayden must tavel for time T before they meet. Thus distance Hayden will cover is = Time T * Hayden Speed.
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Re: Hayden began walking from F to G, a distance of 40 miles [#permalink] New post 04 Mar 2012, 15:05
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Hayden began walking from F to G, a distance of 40 miles, at the same time Ava began walking from G to F on the same road. If Hayden’s walking speed was x miles per hour and Ava’s was y miles per hour, how many miles away from F were they, in terms of x and y, when they met?
(A) \frac{40(x-y)}{x+y}
(B) \frac{40(x-y)}{x+y}
(C) \frac{(x-y)}{x+y}
(D) \frac{40y}{x+y}
(E) \frac{40x}{x+y}

Combined rate of Hayden and Ava is x+y miles per hour, hence they will meet in time=\frac{distance}{rate}=\frac{40}{x+y} hours. In \frac{40}{x+y} hours Hayden will cover distance=rate*time=x*\frac{40}{x+y} miles.

Answer: E.
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Re: Hayden began walking from F to G, a distance of 40 miles [#permalink] New post 04 Mar 2012, 15:07
Thanks Bunuel. But why we are only calculating it for Hayden? That's where I am getting confused buddy.
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Re: Hayden began walking from F to G, a distance of 40 miles [#permalink] New post 04 Mar 2012, 15:14
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enigma123 wrote:
Thanks Bunuel. But why we are only calculating it for Hayden? That's where I am getting confused buddy.


Hayden began walking from F and we are asked how many miles away from F were Hayden and Ava when they met. In 40/(x+y) hours Hayden, at x miles per hour, will cover 40/(x+y)*x miles from F.
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Re: Hayden began walking from F to G, a distance of 40 miles [#permalink] New post 07 Sep 2013, 18:52
This is a confusing problem - especially if someone assumes x = y, then choice D is also valid.
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Re: Hayden began walking from F to G, a distance of 40 miles [#permalink] New post 07 Sep 2013, 20:54
1. Time taken for the two to meet which is also the time walked by Hayden = 40 /x+y hrs
2. Speed of Hayden = x miles/hr
3. Distance traveled by Hayden = 40x / (x+y)
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Re: Hayden began walking from F to G, a distance of 40 miles [#permalink] New post 09 Sep 2013, 02:06
Hayden began walking from F to G, a distance of 40 miles, at the same time Ava began walking from G to F on the same road. If Hayden’s walking speed was x miles per hour and Ava’s was y miles per hour, how many miles away from F were they, in terms of x and y, when they met?

combined speed = x+y miles/hour

time in which it took them to meet = 40/x+y

So, we know that it takes them 40/x+y hours to meet up. The question states that Hayden traveled from F to G and Ava, from G to F. It asks us how far from F (Hayden's starting point) did they meet at. Therefore, to solve for distance (d=r*t) we solve by multiplying Hayden's rate (x) by the time it took them to meet (40/x+y) to get 40x/x+y

ANSWER: E
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Re: Hayden began walking from F to G, a distance of 40 miles [#permalink] New post 22 Apr 2014, 06:10
Bunuel wrote:
enigma123 wrote:
Thanks Bunuel. But why we are only calculating it for Hayden? That's where I am getting confused buddy.


Hayden began walking from F and we are asked how many miles away from F were Hayden and Ava when they met. In 40/(x+y) hours Hayden, at x miles per hour, will cover 40/(x+y)*x miles from F.


Still much is left in explanation :

Ans you will get will be same if you multiply Ava rate with time when they meet :

As Distance travel by ava when they meet : y* 40/(x+y)

Now question has asked distance from F i.e. you have to subtract distance travel by ava from 40.

therefore - 40 - (40y/x+y) = on solving you will get 40x/x+y i.e E

Hope i make it clear
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Re: Hayden began walking from F to G, a distance of 40 miles [#permalink] New post 24 Apr 2014, 00:26
Refer diagram below;

We require to find d (in terms of x & y) (how many miles away from F were they)

Setting up the equation

\frac{d}{x} = \frac{40-d}{y}

(x+y)d = 40x

d = \frac{40x}{x+y}

Answer = E
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Re: Hayden began walking from F to G, a distance of 40 miles [#permalink] New post 24 Apr 2014, 00:27
minkathebest wrote:
This is a confusing problem - especially if someone assumes x = y, then choice D is also valid.



Please refer diagram above. There should be no confusion after :)
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Re: Hayden began walking from F to G, a distance of 40 miles   [#permalink] 24 Apr 2014, 00:27
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