Please help me with this chemistry problem on electrochemical cells!?

Two electrochemical cells are assembled in which these reactions occur:

V2+ + VO2+ + 2H+ ---------- 2V3+ +H2O E⁰cell = 0.616 V

V3+ + Ag+ + H2O ----------- VO2+ + 2H+ +Ag(s) E⁰cell = 0.439 V

Use these data and other tabulated values of standard half-cell potentials to calculate the standard electrode potential for the half-reaction:

V3+ + e- -------- V2+