Process controll instrumentation. Help me solve with proper handwritting solution. Please dont take answers from the other tutors. thanl you. have a nice day

a) In a cylindrical storage tank of 4 m internal diameter is having a salt solution of 1000 g/L concentration. The level of the solution inside the tank is maintained at 10 m, with a steady flow of 5 m/h at inlet and outlet respectively. Suddenly, there is a drop in the inlet flow to 1 m/h, while the salt concentration remained at 1000 g/L. By considering the above situation, calculate the time constant of the system and the liquid-level after a day. 10 Marks