please answer E. and F

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: 4 minutes per car Rinse: 2 minutes per car Wax: 3 minutes per car Hand dry: 9 minutes per car Round your answer to 2 decimal places. If the car wash has a demand of 12 cars per hoc? what is the cycle time of the process (minutes)? e. minutes Round your answer to nearest whole number. Now assume demand is 18 cars per hour. Starting from an empty system (and assuming the stations can work independently), how long would it take (minutes) to wash 5 cars? f. minutes