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# Aaron will jog from home at x miles...

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Intern
Joined: 22 Oct 2017
Posts: 31
Aaron will jog from home at x miles...  [#permalink]

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22 Oct 2017, 08:03
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Hello,

i have the problem, that I cannot use the "plug in" trick for a question from GMAC.

Question:

Aaron will jog from home at x miles per hour and then walk back home by the same route at y miles per hour.
How many miles from home can Aaron jog so that he spends a total of t hours jogging and walking?

a) (xt)/t
b) (x+t)/(xy)
c) (xyt)/(x+y)
d) (x+y+t)/(xy)
e) (y+t)/x - t/y

But I cannot use with "plug in". If I do it like the book "cracking the GMAT" say, all I have to do is to give specific numbers for x, y and t. Than I will get a specific value. Than I have to plug in this numbers in each of the answers and compare them with my number:

Let's say x= 10, y=5 and t=2

Distance = Velocity * time

Distance = 10*2 + 5*2 = 30

But If the book tell the truth, answer c) plugged in with the numbers should be also 30. But it is something else...

--== Message from the GMAT Club Team ==--

THERE IS LIKELY A BETTER DISCUSSION OF THIS EXACT QUESTION.
This discussion does not meet community quality standards. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

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Joined: 25 Feb 2013
Posts: 1218
Location: India
GPA: 3.82
Re: Aaron will jog from home at x miles...  [#permalink]

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22 Oct 2017, 08:05
Dokami wrote:
Hello,

i have the problem, that I cannot use the "plug in" trick for a question from GMAC.

Question:

Aaron will jog from home at x miles per hour and then walk back home by the same route at y miles per hour.
How many miles from home can Aaron jog so that he spends a total of t hours jogging and walking?

a) (xt)/t
b) (x+t)/(xy)
c) (xyt)/(x+y)
d) (x+y+t)/(xy)
e) (y+t)/x - t/y

But I cannot use with "plug in". If I do it like the book "cracking the GMAT" say, all I have to do is to give specific numbers for x, y and t. Than I will get a specific value. Than I have to plug in this numbers in each of the answers and compare them with my number:

Let's say x= 10, y=5 and t=2

Distance = Velocity * time

Distance = 10*2 + 5*2 = 30

But If the book tell the truth, answer c) plugged in with the numbers should be also 30. But it is something else...

Hi,

all official questions are already in GMAT club, trying searching the question.
Math Expert
Joined: 02 Sep 2009
Posts: 49860
Re: Aaron will jog from home at x miles...  [#permalink]

### Show Tags

22 Oct 2017, 08:05
Dokami wrote:
Hello,

i have the problem, that I cannot use the "plug in" trick for a question from GMAC.

Question:

Aaron will jog from home at x miles per hour and then walk back home by the same route at y miles per hour.
How many miles from home can Aaron jog so that he spends a total of t hours jogging and walking?

a) (xt)/t
b) (x+t)/(xy)
c) (xyt)/(x+y)
d) (x+y+t)/(xy)
e) (y+t)/x - t/y

But I cannot use with "plug in". If I do it like the book "cracking the GMAT" say, all I have to do is to give specific numbers for x, y and t. Than I will get a specific value. Than I have to plug in this numbers in each of the answers and compare them with my number:

Let's say x= 10, y=5 and t=2

Distance = Velocity * time

Distance = 10*2 + 5*2 = 30

But If the book tell the truth, answer c) plugged in with the numbers should be also 30. But it is something else...

This question is discussed here: aaron-will-jog-from-home-at-x-miles-per-hour-and-then-walk-135828.html Please go through the discussion and if any questions post in that thread.

--== Message from the GMAT Club Team ==--

THERE IS LIKELY A BETTER DISCUSSION OF THIS EXACT QUESTION.
This discussion does not meet community quality standards. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.

_________________
Re: Aaron will jog from home at x miles... &nbs [#permalink] 22 Oct 2017, 08:05
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