A filtration is carried out for 10min at a constant rate in a leaf filter and thereafter it is continued at constant pressure. This pressure is that attained at the end of the constant rate period. If one quarter of the total volume of the filtrate is collected during the constant rate period, what is the total filtration time? Assume that the cake is incompressible and the filter medium resistance is negligible. Please answer the problem using the formulas below: Constant-Pressure Filtration Vt=2A2(P)gccsV+A(P)gcRm=2KpV+B Constant-rate filtration (P)=[A2gcaccdtdV]V+[AgcRmdtdV]=KvV+C