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Working alone at its own constant rate, a machine seals k [#permalink]
 10 Oct 2006, 15:46
Working alone at its own constant rate, a machine seals k cartons in 8 hours, and working alone 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 certain 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%
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SVP
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D
THE RATIO IS 2:1
THE FASTER CAN DO 2/3 OF ANY JOB THEY BOTH DO AS LONG AS THEY WORK FOR THE SAME TIME
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