PLEASE SOLVE BOTH QUESTIONS. THANK YOU

2. Consider a well mixed tank of volume 2.1 m. Salt water flows in at 0.085 m3/min, and contains 0.925 mole/m of salt. At t = 0+, the inlet salt concentration is doubled to 1.85 mol/m? What is process gain and time constant for this system? (Ans: 1.0; 24.7 min) 3. For the case above, assume that a reaction occurs and salt is consumed by a first order process with a time constant of 0.040 min?. What is process gain and time constant for this system? (Ans: 0.5 and 12.5 min)