We have given
We can write h as function of x
The possible zeros of h(x) is 2 ,because h(x) is polynomial of degree 2.So it has maximum two zeros (It is not necessary that all zeros are real ).Lets draw it graph ,then try to discuss
x=0 then h(x)=24
Thus maximu rise of water= 24 units.
fortunately I can draw its graph.