Help me check this 4 part question

Part IV Capacity Management TS Manufacturing Corp. has the process displayed below. The drilling operation occurs separately from and simultaneously with the sawing and sanding operations. The product only needs to go through one of the three assembly operations (the assembly operations are "parallel") Sawing 15 min/unit Sanding 15 min/unit b) Drilling 27 min/unit Welding 25 min/unit a) Which operation is the bottleneck? (10 pts) is the throughput time for overall system? (10 pts) Assembly 78 min/unit d) What is the efficiency of Welding? (10 pts) Assembly 78 min/unit Assembly 78 min/unit c) If the firm operates 8 hours per day, 20 days per month, what is the daily capacity of the manufacturing process? (10 pts)