In a particular warehouse, if any carton picks from the forward area requires in average 1 minute

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Question:

In a particular warehouse, if any carton picks from the forward area requires in average 1 minute apiece and any carton picks from the bulk storage area requires in average 3 minutes apiece. Assume that it takes 5 minutes to restock to the forward area in average. Given the following three skus storage information, please calculate their labor efficiencies respectively