Please include working

An automated car wash serves customers with the following serial process: pretreat, wash, rinse, wax, hand dry. Each of these steps is performed by a dedicated machine except for the hand-dry step, which is performed manually on each car by one of three workers. The steps of the process have the following processing times: - Pretreat 2 minute per car - Wash: 4 minutes per car - Rinse: 3 minutes per car - Wax 3 minutes per car - Hand dry: 8 minutes per car a. If the car wash has a demand of 20 cars per hour, what is the flow rate of the process? Note: Round your answer to 2 decimal places. b. If the car wash has a demand of 20 cars per hour, what is the utilization of the machine that performs the Wax process? Note: Round your answer to 2 decimal places