A manufacturing process has 2 stations, A and B, that are ordered in sequence. At each station, two tasks are performed one after the other. Suppose the time (in seconds per unit) it takes for a single person to perform each task is as given in the table below Station # of workers Task A1 Task A2 Task B1 Task B2 A 1 20 25 - - B 2 - - 40 40 (e.g., task A2 takes 25 seconds per unit). If station A has 1 worker and station B has two workers to do the different tasks, the capacity of this process under steady state (in units per hr) is