solved Can you help me understand this Management question? Maduro Cleaning

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