11. A water tank has the shape of an inverted circular cone with base radius 2 m and height 4 m. If water is being pumped into the tank at a rate of 2 m3/min, find the rate at which the water level is rising when the water is 3 m deep. (Hint: V = =mr>h) 11) (A) 0.14 m/min (B) 0.28 m/min (C) 2.38 m/min (D) 16.75 m/min (E) none of the above