Please explain how to solve for question D.)

The three-station work cell at Pullman Mfg., Inc. is illustrated in the figure below. It has two machines at station 1 in parallel (i.e., the product needs to go through only one of the two machines before proceeding to station 2). 20 min/unit Station 1 Machine A Station 2 Station 3 15 min/unit 4 min/unit Station 1 Machine B 20 min/unit a) The throughput time is 39 minutes (enter your response as a whole number). b) The bottleneck time of this work cell is 15 minutes per unit (enter your response as a whole number). c) Station 2 is the bottleneck station. d) If the firm operates 11 hours per day, 6 days per week, the weekly capacity of this work cell is 264 units (enter your response as a whole number)