(4 points) A cylinder filled with water has a single hole at the bottom. The rate at which the water level decreases is directly proportional to the square root of the depth of the water in the cylinder. At time t = 0, th depth is 20 cm, and the rate of leakage is d = -4cm/min. Write and solve a differential equation that expresses this situation. Find the time at which the cylinder becomes empty. Round to the nearest tenth of a minute. Work: