Answer :
B. 4.0 units per hour is the capacity of the system.
To determine the capacity of the system, we need to identify the bottleneck, which is the workstation with the longest process time, as it determines the overall system's capacity.
The longest process time is 15 minutes. To find the system's capacity, we convert this time to units per hour:
- 1 hour = 60 minutes
- Capacity = 60 minutes / 15 minutes per unit = 4 units per hour
Therefore, the capacity of the system is 4.0 units per hour (option B).