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# M 20 Q 3

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Manager
Joined: 13 May 2010
Posts: 122

Kudos [?]: 22 [0], given: 4

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22 Feb 2012, 14:40
1
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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.

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?

Kudos [?]: 22 [0], given: 4

Intern
Joined: 16 Nov 2009
Posts: 7

Kudos [?]: 1 [0], given: 0

Re: M 20 Q 3 [#permalink]

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22 Feb 2012, 14:55
That's a good question. I think the question should clarify that as OG's did.

Kudos [?]: 1 [0], given: 0

Manager
Joined: 10 Jan 2011
Posts: 232

Kudos [?]: 75 [0], given: 25

Location: India
GMAT Date: 07-16-2012
GPA: 3.4
WE: Consulting (Consulting)
Re: M 20 Q 3 [#permalink]

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05 Apr 2012, 23:28
This is really good point. question should clarify that all workers are working at same rate
_________________

-------Analyze why option A in SC wrong-------

Kudos [?]: 75 [0], given: 25

Re: M 20 Q 3   [#permalink] 05 Apr 2012, 23:28
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# M 20 Q 3

Moderator: Bunuel

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