7.13. The two tanks shown in Fig. P7-13 are connected in an interacting fashion. The system is initially at steady state with q=10cfm. The following data apply to the tanks: A1=1ft2, A2=1.25ft2,R1=1ft/cfm, and R2=0.8ft/cfm. FIGURE P7-13 (a) If the flow changes from 10 to 11cfm according to a step change, determine H2(s), i.e., the Laplace transform of H2(t), where H2 is the deviation in h2. (b) Determine H2(1),H2(4), and H2(). (c) Determine the initial levels (actual levels) h1(0) and h2(0) in the tanks. (d) Obtain an expression for H1(s) for the unit-step change described above