(Chapter 3: Process Analysis) Consider a process consisting of three resources. The process activities are always performed in the following sequence. Resource 1 has a processing time of 5 minutes per unit. Resource 2 has a processing time of 4 minutes per unit. Resource 3 has a processing time of 6 minutes per unit. Resource 1 is staffed by worker A and A 's wage rate is $13 per hour. Resource 2 is staffed by worker B and B's wage rate is $13 per hour. Resource 3 is staffed by worker C and C 's wage rate is $20 per hour. Assume the demand rate is 8 units/hour. There is unlimited space for buffer inventory between the resources. What is the difference in the total time to produce 20 units if the process starts empty and if the process is busy (i.e. with a full system)? 15 minutes 150 minutes 48 minutes 7.5 minutes