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Intern
Joined: 09 Sep 2010
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Two identical taps fill 2/5 of a tank in 20 minutes. When one of the taps goes dry in how many minutes will the remaining one tap fill the rest of the tank ?
A. 5 minutes
B. 10 minutes
C. 15 minutes
D. 20 minutes

ANS SHUD BE 15 MINS
Senior Manager
Status: GMAT Time...!!!
Joined: 03 Apr 2010
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Schools: Chicago,Tuck,Oxford,cambridge
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Kudos [?]: 48 [1] , given: 7

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Hi Silpajorna,
Welcome to the GMAT club..can u plz check out this question again?
i doubt coz since accd to ur question together they are taking 2/5 to fill in 20 min so rest 3/5 together they will take 30 min more.... if i remove one then it will take more time?
Senior Manager
Joined: 20 Jul 2010
Posts: 270
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Kudos [?]: 53 [1] , given: 9

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If we assume the tap stops after 20 min. Then I guess answer would be - only tap running will take 60 more minutes to fill the tank
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Current Student
Joined: 12 Apr 2010
Posts: 459
Location: Spain
Schools: Chicago (Booth) - Class of 2013
GMAT 1: 740 Q50 V40
WE: Information Technology (Investment Banking)
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They are identical taps so each of them fills 1/5 of the tank in 20 minutes.

There are 3/5 remaining, so it will take 60 minutes (20 minutes for each 1/5) to fill the rest.
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Moderator
Status: battlecruiser, operational...
Joined: 25 Apr 2010
Posts: 984
Schools: Carey '16
GMAT 1: Q V
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Kudos [?]: 123 [0], given: 71

rid82 wrote:
They are identical taps so each of them fills 1/5 of the tank in 20 minutes.

There are 3/5 remaining, so it will take 60 minutes (20 minutes for each 1/5) to fill the rest.

agreed. something wrong with your answer choices....
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Veritas Prep GMAT Instructor
Joined: 26 Jul 2010
Posts: 231
Followers: 164

Kudos [?]: 346 [0], given: 27

A quick point here - from the way the question is worded, we don't even know "when" the first tap stops, as "when" begins a new sentence:

Two identical taps fill 2/5 of a tank in 20 minutes. When one tap stops, how long will it take the other to finish the tap?

Those two sentences are two completely separate thoughts - the first gives us an indication of the combined rate, and the second asks a question. But we don't know at which point the first tap stops - it could be after the tank is half full, or after 30 minutes, or at any other point. That next step is what's missing from this question.
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Moderator
Status: battlecruiser, operational...
Joined: 25 Apr 2010
Posts: 984
Schools: Carey '16
GMAT 1: Q V
Followers: 11

Kudos [?]: 123 [0], given: 71

true. yeah its just a bad question overall i think. but that's just me.
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Manager
Joined: 16 Mar 2010
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Kudos [?]: 83 [0], given: 9

60 minutes if one tap is closed at 2/5 tank
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