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If two copying machines work simultaneously at their

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If two copying machines work simultaneously at their [#permalink] New post 08 Sep 2010, 10:40
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A
B
C
D
E

Difficulty:

  35% (medium)

Question Stats:

75% (01:26) correct 25% (00:11) wrong based on 20 sessions
If two copying machines work simultaneously at their respective constant rates, how many copies do they produce in 5 minutes?
(1) One of the machines produces copies at the constant rate of 250 copies per minute.
(2) One of the machines produces copies at twice the constant rate of the other machine.
[Reveal] Spoiler: OA
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Re: Copying machines [#permalink] New post 08 Sep 2010, 11:05
udaymathapati wrote:
If two copying machines work simultaneously at their respective constant rates, how many copies do they produce in 5 minutes?
(1) One of the machines produces copies at the constant rate of 250 copies per minute.
(2) One of the machines produces copies at twice the constant rate of the other machine.



1. obviously INSUFF since you know nothing about the other machine.
2. INSUFF since you dont know the rate - it could be 10/min or 20/min so end result differs

Combine:
M1 = 250/min
M2 COULD be 500/min OR 125/min since M1 could be the machine that produces 250/min AND the same machine that is twice the rate from 2. so as you can see the end result differrs.

E
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Re: Copying machines [#permalink] New post 08 Sep 2010, 12:14
udaymathapati wrote:
If two copying machines work simultaneously at their respective constant rates, how many copies do they produce in 5 minutes?
(1) One of the machines produces copies at the constant rate of 250 copies per minute.
(2) One of the machines produces copies at twice the constant rate of the other machine.


To answer this question I need to know the rates of both the machines. Without that it is not possible to answer the question
St 1: Only gives me one rate
st 2: Just gives me a relation

1+ 2 = Cannot give me anything since I donot know if 250 c/min is the rate of the faster or the slower machine.

Hence E
Re: Copying machines   [#permalink] 08 Sep 2010, 12:14
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