Series R-L AC Circuit Analysis - Conditional
I think you need to know the circuit current in the second case (220V, 25Hz), otherwise you have 2 equations and three unknown values, such as:


Resistance (R)
Inductance (L)
Circuit current in 2nd case (I2)


The equations are:

V1 = RI1 + jw1*L*I1

V2 = RI2 + jw2*L*I2