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# A speed of y yards per minute is equivalent to which of the

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Intern
Joined: 18 Nov 2007
Posts: 9

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A speed of y yards per minute is equivalent to which of the [#permalink]

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05 Dec 2007, 19:35
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

A speed of y yards per minute is equivalent to which of the following speed in inches per second? (1 yard = 3 feet)

A. 5Y/3
B. 12Y
C. 3Y/5
D. Y/20
E. 15Y

I did it a very long way for reasons I don't know. lol Any shortcuts?

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Director
Joined: 26 Feb 2006
Posts: 900

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05 Dec 2007, 19:46
goodglory wrote:
A speed of y yards per minute is equivalent to which of the following speed in inches per second? (1 yard = 3 feet)

A. 5Y/3
B. 12Y
C. 3Y/5
D. Y/20
E. 15Y

I did it a very long way for reasons I don't know. lol Any shortcuts?

1 ft = 12 inch
3 ft = 12x3 = 36 inches
1 yard = 36 inches
y yard = 36y inches

speed per minuet = 36y inches
speed per second = 36y inches/60 = 3y/5

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Senior Manager
Joined: 09 Oct 2007
Posts: 463

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05 Dec 2007, 21:24
C as well. Best way to solve these (unless someone points out a better way) is by creating a formula and picking smart numbers. Then, with your numbers find the answer choice that yields the same answer.

Himalayan's choice of numbers can't be beaten.

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Director
Joined: 26 Feb 2006
Posts: 900

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11 Dec 2007, 01:00
asdert wrote:
C as well. Best way to solve these (unless someone points out a better way) is by creating a formula and picking smart numbers. Then, with your numbers find the answer choice that yields the same answer.

Himalayan's choice of numbers can't be beaten.

Laxieq, Fig, hong, walker are my grand^2 gurus.

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CEO
Joined: 17 Nov 2007
Posts: 3584

Kudos [?]: 4596 [0], given: 360

Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
GMAT 1: 750 Q50 V40

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11 Dec 2007, 02:49
Himalayan wrote:
Laxieq, Fig, hong, walker are my grand^2 gurus.

You are also very good in quant!

I solved it in the same way with slightly different view:

y [yars/minutes]=y [3 feet / 60 seconds] = y [3 * 12 inches / 60 seconds] =

=y [3 inches/ 5 seconds] =3y/5 [inches/seconds]

Kudos [?]: 4596 [0], given: 360

SVP
Joined: 01 May 2006
Posts: 1794

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11 Dec 2007, 03:02
walker wrote:
Himalayan wrote:
Laxieq, Fig, hong, walker are my grand^2 gurus.

You are also very good in quant!

Agree, he is very good, indeed.

Thanks for the words (and it's soon the time for me to take a "retreat" at GMATClub Math forum)

Kudos [?]: 167 [0], given: 0

11 Dec 2007, 03:02
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