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If Susan takes 9 seconds to run y yards, how many minutes

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If Susan takes 9 seconds to run y yards, how many minutes [#permalink] New post 06 Sep 2013, 02:39
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If Susan takes 9 seconds to run y yards, how many minutes will it take her to run x yards at the same rate?

A)\frac{xy}{9}

B)\frac{9x}{60y}

C)\frac{60xy}{9}

D)\frac{xy}{540}

E)\frac{540x}{y}
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Re: If Susan takes 9 seconds to run y yards, how many minutes [#permalink] New post 06 Sep 2013, 02:44
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caro2789 wrote:
If Susan takes 9 seconds to run y yards, how many minutes will it take her to run x yards at the same rate?

A)\frac{xy}{9}

B)\frac{9x}{60y}

C)\frac{60xy}{9}

D)\frac{xy}{540}

E)\frac{540x}{y}


Rate*Time=Distance.

Since, Susan takes 9 seconds to run y yards, then her rate is Rate=\frac{Distance}{Time}=\frac{y}{9} yards per second.

To run x yards at this rate she'll need Time=\frac{Distance}{Rate}=\frac{x}{(\frac{y}{9})}=\frac{9x}{y} seconds, which is \frac{9x}{60y} minutes.

Answer: B.

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Re: If Susan takes 9 seconds to run y yards, how many minutes [#permalink] New post 09 Sep 2013, 08:27
Susan runs y yards in 9 seconds which means her rate over that particular distance is: r = y/9

We're told to look for how long it will take her to run x yards at the same rate (i.e. r=y/9)

Time taken:
t = d/r
t = x/r
t = x/(y/9)
t = 9x/y
This gives us the time in seconds but we need to multiply by 60 (seconds) to get the time in minutes.

t = 9x/60y

I had a bit of trouble conceptualizing this problem at first, specifically why we would find the time of the new distance (in minutes) by dividing by the old rate. Well, I guess it was a silly problem to be caught up on. All we want to know is how long (t) it will take for x yards to be covered at the same rate we determined to be (y/9) Then, we just had to multiply by 60 seconds to get y in terms of minutes. I guess the final answer tripped me up because of the way it multiplied out (in other words, if t = d/r then why is d here equal to 9 seconds*x distance.) I'm not sure what I can do to help me better understand these kinds of problems. :?

ANSWER: b.) 9x/60y

P.S. Bunuel, I believe you got the correct answer (it's the same one I got) but you marked down the incorrect answer choice.

Cheers! :-D
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Re: If Susan takes 9 seconds to run y yards, how many minutes [#permalink] New post 09 Sep 2013, 09:19
caro2789 wrote:
If Susan takes 9 seconds to run y yards, how many minutes will it take her to run x yards at the same rate?

A)\frac{xy}{9}

B)\frac{9x}{60y}

C)\frac{60xy}{9}

D)\frac{xy}{540}

E)\frac{540x}{y}





since the question is asking for the time in minutes we should first convert 9 seconds into minutes to make things easier:

9 sec x \frac{1 min}{60} sec= \frac{9}{60}min


Rate x Time = Dist.

r x \frac{9}{60} = Y

r = \frac{60Y}{9}



use the same rate as above:

Rate x Time = Dist.

\frac{60Y}{9} x t = X

t = \frac{9X}{60Y}
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Re: If Susan takes 9 seconds to run y yards, how many minutes [#permalink] New post 10 Sep 2013, 23:29
If y = 3, and x = 3

then 9 seconds = 3 yards

How many minutes is 3 yards?

Convert seconds to minutes; 9 seconds = 9/60 minutes

Only answer B matches

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Re: If Susan takes 9 seconds to run y yards, how many minutes [#permalink] New post 11 Nov 2014, 04:13
Solving these kinds of problems always causes trouble for me. Thats why i like to pick numbers.

Is it correct to do so as follows:

Let's say y equals 10 yards and x equals 100 yards. Which would mean that if those 10 yards are ran in 9 seconds, she runs 100 in 1,5. Then filling in this X and Y in the answer choices should result in 1,5 and if so that one is the correct answer.

9x/60y gives 900/600 which equals 1,5 so this is the right equation. Is this a correct way of solving this or did i get lucky?
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Re: If Susan takes 9 seconds to run y yards, how many minutes [#permalink] New post 12 Nov 2014, 00:53
y yards in 9 seconds, so 1 yard in \frac{9}{y} seconds

x yards would take \frac{9}{y} * x seconds = \frac{9x}{60y} minutes

Answer = B
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Re: If Susan takes 9 seconds to run y yards, how many minutes [#permalink] New post 12 Nov 2014, 03:31
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JoostGrijsen wrote:
Solving these kinds of problems always causes trouble for me. Thats why i like to pick numbers.

Is it correct to do so as follows:

Let's say y equals 10 yards and x equals 100 yards. Which would mean that if those 10 yards are ran in 9 seconds, she runs 100 in 1,5. Then filling in this X and Y in the answer choices should result in 1,5 and if so that one is the correct answer.

9x/60y gives 900/600 which equals 1,5 so this is the right equation. Is this a correct way of solving this or did i get lucky?


That's correct.

Note though, that for plug-in method it might happen that for some particular number(s) more than one option may give "correct" answer. In this case just pick some other numbers and check again these "correct" options only.

Hope it helps.
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NEW TO MATH FORUM? PLEASE READ THIS: ALL YOU NEED FOR QUANT!!!

PLEASE READ AND FOLLOW: 11 Rules for Posting!!!

RESOURCES: [GMAT MATH BOOK]; 1. Triangles; 2. Polygons; 3. Coordinate Geometry; 4. Factorials; 5. Circles; 6. Number Theory; 7. Remainders; 8. Overlapping Sets; 9. PDF of Math Book; 10. Remainders; 11. GMAT Prep Software Analysis NEW!!!; 12. SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) NEW!!!; 12. Tricky questions from previous years. NEW!!!;

COLLECTION OF QUESTIONS:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS ; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


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Re: If Susan takes 9 seconds to run y yards, how many minutes   [#permalink] 12 Nov 2014, 03:31
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