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. \(33\frac13\%\)
C. \(50\%\)
D. \(66\frac23\%\)
E. \(75\%\)
Answer: D
Source: GMAT Prep
Working alone at its own constant rate, a machine seals \(k\) cartons in \(8\) hours, and working alone at its own const
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