Sand is poured onto a surface at 20 cm/s, forming a conical pile whosebase diameter is always equal to its altitude.How fast (in cm/s) is

Sand is poured onto a surface at 20 cm³/s, forming a conical pile whosebase diameter is always equal to its altitude.How fast (in cm/s) is the altitude of the pile increasing when the pile is 3 cm high? Remember, the volume of a cone is V =?r ².Note: Round to the nearest hundredth.