explain and solve.

A cylindrical tank is initially empty. At time-0, the feed flow is set to 1 L/min and the effluent flow is set to 0.5 /min. Both flow rates are constant. See the figure below: qf 20 cm 20 cm h(e]] ge a) Show the mass balance b) Show the changing height as a function of time, h(t). c) Determine the time when the tank overflows