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Hayden began walking from F to G, a distance of 40 miles [#permalink]
04 Mar 2012, 12:14

1

This post was BOOKMARKED

00:00

A

B

C

D

E

Difficulty:

55% (hard)

Question Stats:

64% (02:33) correct
36% (02:06) wrong based on 119 sessions

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 Haydens walking speed was x miles per hour and Avas was y miles per hour, how many miles away from F were they, in terms of x and y, when they met?

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?

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. _________________

The question is not can you rise up to iconic! The real question is will you ?

Re: Hayden began walking from F to G, a distance of 40 miles [#permalink]
04 Mar 2012, 15:05

Expert's post

1

This post was BOOKMARKED

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 Haydens walking speed was x miles per hour and Avas 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.

Re: Hayden began walking from F to G, a distance of 40 miles [#permalink]
04 Mar 2012, 15:14

1

This post received KUDOS

Expert's post

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. _________________

Re: Hayden began walking from F to G, a distance of 40 miles [#permalink]
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) _________________

Re: Hayden began walking from F to G, a distance of 40 miles [#permalink]
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 Haydens walking speed was x miles per hour and Avas 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

Re: Hayden began walking from F to G, a distance of 40 miles [#permalink]
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

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