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: 1 minute per car Wash: 6 minutes per car Rinse: 2 minutes per car Wax: 2 minutes per car Hand dry: 9 minutes per carA. If the car was has a demand of 15 cars per hour, what is the flow rate of the process? B. if the car wash has a demand of 15 cars per hour, what is the utilication of the machine that performs the wax process?