3 Water is flowing at the rate of 50 m/min from a shallow concrete conical reservoir (vertex down) of base radius 45 m and height 5 m. a. How fast (centimeters per minute) is the water level falling when the water is 3 m deep? b. How fast is the radius of the water's surface changing then? Answer in centimeters per minute. cm/min. a. The water level is falling at (Round to two decimal places as needed.)