Hi,

Please can you help me with the below PS?

Working alone at its own constant rate, a machine seals k cartons in 8 hours, and working alone at its constant rate, a second machine seals k cartons in 4 hours. If the 2 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?

Answer is 66 2/3 %
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Thanks,
Anindita