Songjiang district property cleaning water tank

The work done on water in the two cases is different, because the work done by the outside increases the center of gravity of the whole box of water by 2.5 m, because the water is injected through pipe A; With B-tube water injection, because every part of water is injected from the top of the water tank through B-tube, the work done for the whole tank of water is equivalent to raising the center of gravity of water by 5m.

So WA=ρgV? deuterium

WB=ρgV？ H

So wawb = 12

So the answer is: 1: 2.