A steady state nominal flow rate of 0.06 m3/hr is applied to a tank with a curved surface area of 1 m2. According to F = 0.25h, the tank's outlet flow rate and liquid level height are related. Inlet flow rate abruptly changes at time t = 0 from 0.02 m3/hr to 0.24 m3/hr and remains there. After three hours, what is the liquid level's final height in the tank?