Image import is currently broken, IT are on the case so either it'll be fixed soon-ish or the whole site will disappear....
You generate a good mesh by reviewing, and then completing the tutorials.
If all of the inlets are the same label then it depends on the boundary type. Velocity will be 2m/s on each surface. Pressure will be equal to the setting on each surface. Mass flow will be over all boundary area, so each surface will get a fraction of the total based on area and the sum will be what you set in the panel.
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