You have a 15 m^3 tank that has a stream of pure water entering at 0.1 m^3/min and it is being drained at 0.1 m^3/min. The initial solids concentration in the tank is 0.001 kg solid/kg solution.The tank is continuously stirred, well mixed, and is initially full. The density is 1000 kg/m^3 and is constant. What would the solids concentration be in the tank at 45 minutes?