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The conical watering pail with height 0.45 m and radius 0.15 m has a grid of holes. Water flows out through the holes at a rate of KA m'/min, where k is a constant and A is the surface area of the part of the cone in contact with the water. This surface area is A = arvh2 + 2 and the volume is V = 1xroh. Calculate the rate h at which the water level changes at h = 0.27 m, assuming that k = 0.24 m/min. 0.15 m 0.45 m h (Give your answer to two decimal places.) dh dt m/min