ok... this was the question on my final exam- you have to give 1000mL over 24 hrs- how many mL/hr? so i did the math 1000/24= 41.66 now I know to round up to 42... so 42ml/hr But..... as I was thinking about it and as I checked my answer my doing 42x24=1008 so if 42 was right wouldn't the bag run on empty causing air to go in the line? So I put on the test 41 which they graded wrong. 41mL/hr would not cause the bag to run on empty and it would not cause air to go in the line- so wouldnt have to prime it either Any ideas if I may be correct?