Consider the process below. The task time for one worker to complete each step is listed within the box for that step. Please note that all products go to all steps. There is one worker at steps A, B, and C. There are two workers at step D. For step D, both workers can work at the same time. That is, the first worker will work on the first item that comes to the workstation. While the first worker is working on the first item, a second item comes to the workstation, and the second worker starts working on it. Then, the first worker starts working on the third item, and so on.

What is the Capacity of Step D, in units per hour? Please round to one decimal place.

Step B 4 minutes Step A Step D 2 minutes 5 minutes Step C 3 minutes