The three-station work cell illustrated in the figure below has a product that must go through one of the two machines at station 1 (they are parallel) before proceeding to station 2 Capacity: 20 units/hr Station 1 Machine A Save Station 1 Machine B Capacity: 20 unitshr Station 21 Station 3 Capacity Capacity 5 units 6 units Capacity: 20 units/hr Station 1 Machine A Station 1 Machine B Station 2 Capacity: Station 3 Capacity: 5 units/hr 6 units/hr Capacity: 20 units/hr a) The bottleneck time of the system is minutes per unit (enter your response as a whole number). E