For Relay A, the primary impedances for the required distance settings are:
the Z1 setting is 80% of impedance 1-2, or 0.8(4 + j20) ohms = 3.2 + j16 ohms.
the Z2 setting is 120% of impedance 1-2, or 1.2(4+l20) ohms = 4.8 + j24 ohms.
the Z3 setting is 100% of impedance 1-2 plus 120% impedance...