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One hour after Adrienne started walking the 60 miles from X [#permalink]

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26 Dec 2010, 07:54

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One hour after Adrienne started walking the 60 miles from X to Y, James started walking from X to Y as well. Adrienne walks 3 miles per hour and James walks 1 mile per hour faster than Adrienne. How far from X will James be when he catches up to Adrienne?

A) 8 miles B) 9 miles C) 10 miles D) 11 miles E) 12 miles

Whats the best way to solve this problem? Is the distance from X to Y in the problem matter? Please give me detailed steps. Thank you.

Whats the best way to solve this problem? Is the distance from X to Y in the problem matter? Please give me detailed steps. Thank you.

One hour after Adrienne started walking the 60 miles from X to Y, James started walking from X to Y as well. Adrienne walks 3 miles per hour and James walks 1 mile per hour faster than Adrienne. How far from X will James be when he catches up to Adrienne?

A) 8 miles B) 9 miles C) 10 miles D) 11 miles E) 12 miles

James walked for t hours at the rate of 4 miles per hour and Adrienne walked for t+1 hours at the rate of 3 miles per hour;

When James catches up to Adrienne they will walk the same distance, so 3(t+1)=4t --> t=3 --> d=4t=12.

Thanks Bunuel. So, we don't care about the miles apart (60 miles, in this case) to solve the problem? Whatever the distance, we just equate both RT?

Yes, this info is just to confuse us.

Bunuel,

Why is it that in the referenced problem we disregard the total distance from x to y and just set RT (Adrienne) = RT (James), but in this problem (a-bullet-train-leaves-kyoto-for-tokyo-traveling-240-miles-30242.html) we calculate the distance traveled of the KT and TK train?

Is it because if you're chasing someone, the distance traveled once you've caught up is the same - whereas if two objects are colliding, and if their rates are different, the distance traveled canot be assumed to be the same?

Thanks Bunuel. So, we don't care about the miles apart (60 miles, in this case) to solve the problem? Whatever the distance, we just equate both RT?

Yes, this info is just to confuse us.

Bunuel,

Why is it that in the referenced problem we disregard the total distance from x to y and just set RT (Adrienne) = RT (James), but in this problem (a-bullet-train-leaves-kyoto-for-tokyo-traveling-240-miles-30242.html) we calculate the distance traveled of the KT and TK train?

Is it because if you're chasing someone, the distance traveled once you've caught up is the same - whereas if two objects are colliding, and if their rates are different, the distance traveled canot be assumed to be the same?

Re: One hour after Adrienne started walking the 60 miles from X [#permalink]

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31 Oct 2013, 19:14

Kindly refer screenshot below:

Attachment:

s.JPG [ 40.56 KiB | Viewed 3345 times ]

60 miles distance (between X & Y) is not required for calculation in this problem. However, had the problem been "How far from point Y these two met"? then it was required
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Re: One hour after Adrienne started walking the 60 miles from X [#permalink]

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07 Nov 2013, 08:37

One hour after Adrienne started walking the 60 miles from X to Y, James started walking from X to Y as well. Adrienne walks 3 miles per hour and James walks 1 mile per hour faster than Adrienne. How far from X will James be when he catches up to Adrienne?

First, determine how far Adrienne has walked in the one hour. She has walked three miles which means she is three miles ahead of James when he sets off. James walks at four miles/hour which means that every hour, james will get one mile closer to Adrienne. If he gets one mile closer every hour, it will take him three hours to catch up to her which means he travels 3hours * 4 miles/hour = 12 miles and she travels 4 hours * 3 miles/hour = 12 miles. He will be 12 miles from X when he catches up to her.

A slightly different way to solve...

We don't know how long they will walk before they catch up to one another but we do know that A walks for one hour more than J. J = T and A = T+1. We are looking for the distance at which they meet up which means the distance will be the same. D=r*t so,

Re: One hour after Adrienne started walking the 60 miles from X [#permalink]

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13 Dec 2014, 14:31

Hello from the GMAT Club BumpBot!

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Re: One hour after Adrienne started walking the 60 miles from X [#permalink]

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03 Oct 2016, 09:10

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.
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