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# PS - Distance

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Director
Joined: 10 Feb 2006
Posts: 664
Followers: 3

Kudos [?]: 118 [0], given: 0

PS - Distance [#permalink]  17 Nov 2007, 07:12
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
Attachments

Lindsay can paint 1.doc [40.5 KiB]

_________________

GMAT the final frontie!!!.

VP
Joined: 08 Jun 2005
Posts: 1147
Followers: 6

Kudos [?]: 127 [0], given: 0

Lindsay can paint 1/x of a certain room in 20 minutes.

Meaning she can paint 3/x of the room in one hour (20min*3).

Joseph can paint 1-3/x of the room in one hour or x/x-3/x = x-3/x

And in 20min (60min/3) he can paint (x-3)/x/3 of the room.

(x-3)/3x

Director
Joined: 09 Aug 2006
Posts: 766
Followers: 1

Kudos [?]: 68 [0], given: 0

I used x = 10 and whole room = 20, made some lengthy calculations, and arrived at C as the answer.

Then I saw Killer's concise and elegant solution
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