Consider a four-step serial process with processing times given in the list below. There is one machine at each step of the process, and this is a machine-paced process. Step 1: 17 minutes per unit Step 2:22 minutes per unit Step 3: 30 minutes per unit Step 4: 11 minutes per unit Assuming that the process starts out empty, how long will it take (in minutes) to complete a batch of 9 units? (Round to the nearest minute and fill in only a whole number.) If we add one more machine to the bottleneck of the above 4-step process, what is the capacity of the process in units per hour? Round your answer to the 1" decimal place. Fill in a number only. No unit. No letter. No symbols. No explanation. No partial credit. A call center has three operators who answer incoming calls. It takes an operator 5 minutes to answer one call. What is the capacity of the call center expressed in calls per hour