Question 759628
Volume of water plus cube = {{{24*pi*(15)^2}}} {{{cm^3}}}
The radius is 15 because the diameter is 30.


The volume of the cube by itself is {{{10^3}}} or {{{1000}}} {{{cm^3}}}.


The volume of just the water will be their difference:
{{{24*pi*(15)^2-1000}}} {{{cm^3}}}


Use the formula again for volume of a cylinder.  The height or depth, h will be an unknown for which you will solve for:
{{{highlight(h*pi*15^2=24*pi*(15)^2-1000)}}}
Solve for h.