The production line operates 8 hours per day, the line breakdown one hour daily for maintenance. The line contains from 4 workstations operates sequentially as the following table and actual output of line 280 unit per day.

Workstations	1	2	3	4
Production time (unit/minute)	0.8	0.9	1.0	0.7

1. What is the capacity per workstation in the production line?
2. What is capacity of all system?
3. At what percentage of the system efficiency (the operational line efficiency).