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OG-17 (DIAGNOSTIC TEST)

This topic has 4 expert replies and 1 member reply
acegmat29 Newbie | Next Rank: 10 Posts Default Avatar
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OG-17 (DIAGNOSTIC TEST)

Post Sat Apr 29, 2017 4:55 am
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/y
B.(x+t)/xy
C.xyt/(x+y)
D.(x+y+t)/xy
E.(y+t)/x-t/y

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Post Sat Apr 29, 2017 9:02 am
Hi acegmat29,

This question can be solved by TESTing VALUES. I'm going to give you a couple of hints so that you can attempt this question on your own...

1) Since this question has so many variables, you want to make sure that the variables are easy to work with. Try using X = 3 miles/hour and Y = 2 miles/hour and set each distance at 6 miles.
2) You'll have to do some simple calculations to figure out the time traveled in each direction and the total time (T), which you'll need to answer the question.
3) TEST those values in the answer choices; you're looking for answer that equals 6.

GMAT assassins aren't born, they're made,
Rich

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Post Wed May 03, 2017 11:45 am
Mo2men wrote:
Dear Experts,

What does the stem ask for? I understood it as if I will use the total time to find NEW distance form home? How can In interpret t correctly?

Thanks
We can infer that the time t is defined as the total time spent jogging and walking. It's as if he knows exactly how long he wants to spend, and knows exactly the speeds at which he'll jog and walk. And based on that, he wants to determine how far he can go.

So there's no such thing as "new" or "old" distance. Imagine that before he leaves the house, he has a plan: "I want to go a total of t hours, and my speeds are x for jogging and y for walking. So that means I can jog a distance of d miles, then turn around and walk back the same d miles."

Did that help?

I posted a full algebraic solution here: http://www.beatthegmat.com/og-13-24-t288366.html#765096

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Harvard Graduate School of Education


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Post Sat Apr 29, 2017 9:02 am
Hi acegmat29,

This question can be solved by TESTing VALUES. I'm going to give you a couple of hints so that you can attempt this question on your own...

1) Since this question has so many variables, you want to make sure that the variables are easy to work with. Try using X = 3 miles/hour and Y = 2 miles/hour and set each distance at 6 miles.
2) You'll have to do some simple calculations to figure out the time traveled in each direction and the total time (T), which you'll need to answer the question.
3) TEST those values in the answer choices; you're looking for answer that equals 6.

GMAT assassins aren't born, they're made,
Rich

_________________
Contact Rich at Rich.C@empowergmat.com

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Post Wed May 03, 2017 11:45 am
Mo2men wrote:
Dear Experts,

What does the stem ask for? I understood it as if I will use the total time to find NEW distance form home? How can In interpret t correctly?

Thanks
We can infer that the time t is defined as the total time spent jogging and walking. It's as if he knows exactly how long he wants to spend, and knows exactly the speeds at which he'll jog and walk. And based on that, he wants to determine how far he can go.

So there's no such thing as "new" or "old" distance. Imagine that before he leaves the house, he has a plan: "I want to go a total of t hours, and my speeds are x for jogging and y for walking. So that means I can jog a distance of d miles, then turn around and walk back the same d miles."

Did that help?

I posted a full algebraic solution here: http://www.beatthegmat.com/og-13-24-t288366.html#765096

_________________


Ceilidh Erickson
Manhattan Prep GMAT & GRE instructor
EdM in Mind, Brain, and Education
Harvard Graduate School of Education


Manhattan Prep instructors all have 99th+ percentile scores and expert teaching experience.
Sign up for a FREE TRIAL, and learn why we have the highest ratings in the GMAT industry!

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Mo2men Legendary Member Default Avatar
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Post Sat Apr 29, 2017 8:00 am
Dear Experts,

What does the stem ask for? I understood it as if I will use the total time to find NEW distance form home? How can In interpret t correctly?

Thanks

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