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# If two copying machines work simultaneously at their

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Senior Manager
Joined: 10 Dec 2004
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If two copying machines work simultaneously at their [#permalink]  23 Feb 2005, 19:31
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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.
Director
Joined: 19 Nov 2004
Posts: 563
Location: SF Bay Area, USA
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E. It is a trick question. Think about it you will figure out.
Manager
Joined: 21 Jun 2004
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E it is - and not C - which might have been a forced conclusion.
Manager
Joined: 19 Nov 2004
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a) know information about the other machine unsuff
b) unsuff either
Together from b can be 2 variants 500 or 125 copies per minute for the second machine
Manager
Joined: 11 Jan 2005
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E
as we dont know have any clue of which perform what
Manager
Joined: 01 Jan 2005
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Location: NJ
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another E.

I) the rate of one machine is not enough to calculate .
II) this info alone is not enough

I) & II) We don't know which of the following 2 cases:-
250 & 500
125 & 250
Manager
Joined: 24 Jan 2005
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Location: Boston
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Should be E as we don't know which one is greater
Intern
Joined: 19 Dec 2004
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is it E because the machine referred to in B could be the one referred to in A or the other machine?
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