A 3 m diameter by 4.5 m high tank kept of density vertically is 1000 kg/m at the rate of 2000 kg/min and is receiving water 3 discharging through a 15 cm diameter line with a constant velocity of 1.5 m/s. At a given instant, the tank is half full. Find the water level and mass change in the tank 15 minutes later.
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