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If two copying machines work simultaneously at their [#permalink]

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08 Sep 2010, 10:40

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E

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64% (00:31) correct 36% (00:35) wrong based on 278 sessions

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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.

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.

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.

If two copying machines work simultaneously at their [#permalink]

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28 Jan 2012, 03:01

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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.

Last edited by Bunuel on 27 Feb 2012, 03:47, edited 2 times in total.

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.

Straight E, though a little bit tricky. All we need to know is the rates of these machines. Though from both statement the rates can be: 250 copies per minute and 500 copies per minute; 250 copies per minute and 125 copies per minute.

Re: If two copying machines work simultaneously at their [#permalink]

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25 Jul 2016, 08:41

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Re: If two copying machines work simultaneously at their [#permalink]

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01 Nov 2016, 16:23

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