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M 20 Q 3

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Manager
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M 20 Q 3 [#permalink] New post 22 Feb 2012, 13:40
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If 2 excavators can dig a 10-meter long trench in 50 minutes, how long will it take 3 excavators to dig a 15-meter long trench?

(C) 2008 GMAT Club - m20#3

* 45 minutes
* 50 minutes
* 52 minutes
* 54 minutes
* 60 minutes

1 excavator can dig a 10-meter long trench in 50*2 = 100 minutes. So, it can dig a 15-meter long trench in 100*1.5 = 150 minutes. 3 excavators can dig a 15-meter long trench in \frac{150}{3} = 50 minutes.
The correct answer is B.


As per above exp, we are really making an assumption that all workers are working at equal rates....how can you make that assumption unless given in the question?
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Re: M 20 Q 3 [#permalink] New post 22 Feb 2012, 13:55
That's a good question. I think the question should clarify that as OG's did.
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Re: M 20 Q 3 [#permalink] New post 05 Apr 2012, 22:28
This is really good point. question should clarify that all workers are working at same rate
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-------Analyze why option A in SC wrong-------

Re: M 20 Q 3   [#permalink] 05 Apr 2012, 22:28
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