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If Susan takes 9 seconds to run y yards, how many minutes will it take [#permalink]
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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 will it take [#permalink]
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06 Sep 2013, 02:44



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Re: If Susan takes 9 seconds to run y yards, how many minutes will it take [#permalink]
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09 Sep 2013, 08:27
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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/60yP.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!



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Re: If Susan takes 9 seconds to run y yards, how many minutes will it take [#permalink]
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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 will it take [#permalink]
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10 Sep 2013, 23:29
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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
t1000



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Re: If Susan takes 9 seconds to run y yards, how many minutes will it take [#permalink]
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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 will it take [#permalink]
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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 will it take [#permalink]
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12 Nov 2014, 03:31
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 plugin 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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If Susan takes 9 seconds to run y yards, how many minutes will it take [#permalink]
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24 Nov 2014, 06:28
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Re: If Susan takes 9 seconds to run y yards, how many minutes will it take [#permalink]
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24 Nov 2014, 08:16
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The answer is B. She runs x yards in 9x/y seconds =9x/60y minutes.



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Re: If Susan takes 9 seconds to run y yards, how many minutes will it take [#permalink]
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24 Nov 2014, 12:18
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This question is asking Time in minutes. Susan takes \(9\) seconds to run \(Y\) yards. So her speed is \(\frac{Y}{9}\)yards per second.
Let us convert seconds to minutes.
Speed in minutes: \(\frac{60Y}{9}\) yards per minute
\(Time= \frac{Distance}{Speed}\)
\(Time\) \(=\)\(\frac{x}{60Y/9}\) minutes \(=\)\(\frac{9x}{60Y}\) minutes
Answer: B



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Re: If Susan takes 9 seconds to run y yards, how many minutes will it take [#permalink]
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24 Nov 2014, 19:09
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Answer = B = \(\frac{9x}{60y}\) y Yards >> Time taken = 9 seconds = \(\frac{9}{60}\) Minutes 1 Yard \(= \frac{9}{60} * \frac{1}{y} = \frac{9}{60y}\) Minutes For x Yards, time required \(= \frac{9}{60y} * x = \frac{9x}{60y}\)
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Re: If Susan takes 9 seconds to run y yards, how many minutes will it take [#permalink]
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25 Nov 2014, 04:29
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Susan rate is y/9 yard/second =60y/9 yard/minute.
So to cover x yard , time =x/(60y/9)=9x/60y
Answer B



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Re: If Susan takes 9 seconds to run y yards, how many minutes will it take [#permalink]
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25 Nov 2014, 04:56
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Susan runs x yards in 9x/y seconds Let’s convert this into minutes and we will get time=9x/60y minutes. Answer B
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Re: If Susan takes 9 seconds to run y yards, how many minutes will it take [#permalink]
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Re: If Susan takes 9 seconds to run y yards, how many minutes will it take [#permalink]
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26 Nov 2015, 08:21
9 seconds/y yards=(9/60 min)/y yards rate=y/((9/60)=60y/9 yards per minute x yards/(60y/9)=9x/60y minutes



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Re: If Susan takes 9 seconds to run y yards, how many minutes will it take [#permalink]
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04 Dec 2016, 19:40
Susan rate= y yds/ 9 seconds. How many minutes to run x yds at the same rate?
Convert yards/seconds into yards/ minutes. (Y yards / 9 seconds) * (60 seconds / 1 min) = 60y yards / 9 minutes. This is rate.
Distance = x yards. Use D=RT to find the time. X = (60y/9) (time) (X / 1)* (9/60y) = 9x/60y
Answer: B



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Re: If Susan takes 9 seconds to run y yards, how many minutes will it take [#permalink]
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17 May 2017, 20:43
The answer is B. She runs y yards in 9 seconds (or 9/60 minutes) So, using the Unitary method, she runs 1 yard in (9/60y) Minutes. She runs x yards = 9x/60y minutes.



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Re: If Susan takes 9 seconds to run y yards, how many minutes will it take [#permalink]
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19 May 2017, 02:29
USING..... Speed=Distance/ Time Susan runs y yards in 9 seconds As we know, 1 minutes = 60 seconds So, Susan runs y yards in 9/60 minutes Now, using speed formula we can find her speed that will be 9/60y Time in minutes she will take to run x yards at the same rate will be = 9x/60y minutes.
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Re: If Susan takes 9 seconds to run y yards, how many minutes will it take [#permalink]
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22 May 2017, 17:36
Bunuel wrote: Tough and Tricky questions: Distance/Rate. 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) xy/9 B) 9x/(60y) C) 60xy/9 D) xy/540 E) 540x/y We are given that the rate of Susan is y/9 yards per second and we need to determine how many minutes it will take her to run x yards. time = distance/rate time = x/(y/9) = 9x/y seconds Let’s convert 9x/y seconds to minutes: 9x/y seconds = (9x/y)/60 = 9x/(60y) minutes Answer: B
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