A firm produces handbags using three workers. On Tuesday, Jane completed 60 bags in 6 hours, Ron completed 50 bags in 7 hours, and Mary completed 80 bags in 5 hours. What was the overall productivity of the firm?
7.92 bags/hour
11.05 bags/hour
10.00 bags/hour
10.56 bags/hour
61.67 bags/hour