please explain the problem c3q4

PA 3-8 (Algo) Consider a four-step serial process... Consider a four-step serial process with processing times given in the following list. There is one machine at each step of the process, and this is a machine-paced process. - Step 1: 24 minutes per unit - Step 2: 19 minutes per unit - Step 3: 35 minutes per unit - Step 4: 15 minutes per unit Assuming that the process starts out empty, how long will it take (in hours) to complete a batch of 88 units? Note: Do not round intermediate calculations. Round your answer to nearest hour