Answer:
In this question ;
key word is <em><u>descends</u></em> which means <em><u>going down</u></em>
now the position is -300 which means it's under water and it descends 115 m that means now it's even more under water
position now is -300 -115 = <u>-415m</u>
<u> </u>
I solved this problem for you. Your answer is 6/11
Since the cross section is uniform, the depth of the water is irrelevant. The rate of change of height is the rate of change of volume divided by the area.
dh/dt = (dV/dt)/(π·r²)
= (9 ft³/min)/(π·(3 ft)²)
= 1/π ft/min ≈ 0.3813 ft/min
