[Geometry] how to calculate water level rise

The question : "Water is siphoned from a conical water tower of base diameter 3 m and height 4 m. If the cone was originally full, and the water is transferred to a rectangular tank of base measurements10 m by 8 m, by how much will the water in the rectangular tank rise?"

I calcucated the volume of the cone using the formula ((1/3)πr^2•h) so that would be ((1/3)π•1.5^2•4) = ~9.42m^3

And the base of the rectangular prism would obviously be 80m^2 but beyond that I am not sure how to proceed.