Water enters a 2.00-m³ tank at a rate of 6.00 kg/s and is withdrawn at a rate of 3.00 kg/s. The tank is initially half full. 

(a) Is this process continuous, batch, or semibatch? Is it transient or steady state? 

(b) Write a mass balance for the process. Identify the terms of the general balance equation (Equation 4.2-1) present in your equation and state the reason for omitting any terms. 

(c) How long will the tank take to overflow?