The tank has height 6 m and the diameter at the top is 4 m.

The tank has 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, nd the rate at which water is being pumped into the tank. At a constant temperature, the pressure P and volume V satisfy the equation PV C, where C is a constant. Suppose that at a certain instant the volume is 600 cm3, the pressure is 150 kPa, and the pressure is increasing at a rate of 20 kPa min. At what rate is the volume decreasing at this instant?