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# PS Rates

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Manager
Joined: 07 Jan 2008
Posts: 86

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01 Dec 2008, 07:19
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Working along at its own constant rate, a machine seals k cartons in 8 hours, and working along at its own constant rate, a second machine seals k cartons in 4 hours. If the two machines, each working at its own constant rate and for the same period of time, together sealed a number of cartons, what percent of the cartons were sealed by the machine working at the faster rate?

A. 25%
B. 33 1/3%
C. 50%
D. 66 2/3 %
E. 75%
Manager
Joined: 27 May 2008
Posts: 199

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01 Dec 2008, 07:30
D

machine A -- 8 hrs
machne B -- 4 hrs

B = 2A, So B/(A+B) = 2/3 = 66 2/3%
Re: PS Rates   [#permalink] 01 Dec 2008, 07:30
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