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Each week we'll be posting several questions from The Official Guide for GMAT® Review, 13th Edition and then after couple of days we'll provide Official Answer (OA) to them along with a slution.

We'll be glad if you participate in development of this project: 1. Please provide your solutions to the questions; 2. Please vote for the best solutions by pressing Kudos button; 3. Please vote for the questions themselves by pressing Kudos button; 4. Please share your views on difficulty level of the questions, so that we have most precise evaluation.

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Since t = 11 seconds represents time, one can immediately eliminate answers C,D and E, because they don't have units of time. (C) x/(ty) has units of 1/time (D) t/(xy) has units of time/speed squared, which finally is time cubed/distance squared (E) xy/t has units of speed squared/time, which finally is distance squared/time cubed

To choose between (A) and (B), we should keep in mind that time is distance/speed. Since the distance in our case is x, it should appear in the numerator.

Hence, Answer A. _________________

PhD in Applied Mathematics Love GMAT Quant questions and running.

Re: If Juan takes 11 seconds to run y yards, how many seconds [#permalink]
14 Feb 2015, 09:47

pacifist85 wrote:

This was an easy one, but I do have a questions concerning rates.

When is it that we HAVE to find the rate at which 1 unit of work is done, in order to calculate another rate?

I hope my question is understandable...

Thank you, Natalia

If you construct a table which is like the one given below it will be clear to you what you have been given and what you need to find out what is asked. For this question, R * T = D ? * 11 = y

and we need to find out

R * T = D ? * ? = x you need the rate here to find out the time.That as specified by the question is the same as the first case. So R=y/11. So time=x/(y/11)=11x/y.

Kudos please if this helped anyhow.

gmatclubot

Re: If Juan takes 11 seconds to run y yards, how many seconds
[#permalink]
14 Feb 2015, 09:47

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