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Can you help me understand this Management question?

Maduro Cleaning is a small organization that provides cleaning services to both residential and commercial clients. As a small organization, the owner assigns crews of two, three, or four employees to jobs each morning but the owner does not have a good method of determining a reasonable amount of time that each cleaning should take. The owner decided to keep data on job times and crew sizes in the hopes of developing a productivity measure. 

Address the following requirements:

• Calculate which of the crew sizes has the best productivity per worker and explain your method. 
• Evaluate your outcome and the possible reasons that would explain those results. 
• Project what the productivity might be for a crew size of five and explain your reasoning. 

Crew Size Avg: Productivity per Crew

• 2: 3765 square meters per day
• 3: 4915 square meters per day
• 4: 6309 square meters per day