A bottom area 4x4x3.14 = 50.24 = 50.24cm2.

B The bottom area is 3x3x3. 14=28.26 square centimeters.

The height difference per minute is 54.94(50.24-28.26)= 2.5cm.

The water depth is 2.5x4+ 10 = 20cm.

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