Water is leaking out of an inverted conical tank at a rate of 7,500 cm³/min at the same time that water is being pumped into the tank at a constant rate. The tank has a height 6 m and the diameter at the top is 4 m. If the water level is rising at a rate of 20 cm/min when the height of the water is 2 m, find the rate (in cm³/min) at which water is being pumped into the tank. (Round your answer to the nearest integer.)