The steady state input current of a tank with a cross-sectional area of 4 m2 is 4 m3/min. The flow rate of the water leaving the pool is a linear function of the height (Qoutput= h/R) and the R constant is 1 m/m3/min. At steady state the height of the pool is 4 m and at t=0 the inlet current is cut off. What is the water height at t=0.26 min