3 phase cable equivalent circuit
Oooh this is (not) fun. Didn't see it used for power transmission yet; As I see it, they attached an impedance meter between each of the ABCN (L1 L2 L3 N for us europeans) on the left and every other ABCN on the right, the recorded Z is put on the table. The matrix has to be symmetrical (otherwise the cable from a two port system view would be… interesting)
You actually didn't specify the single most important parameter, i.e. the working frequency.
The equivalent circuit you need to use is already given, a metric ton of phasor algebra will give you the values for the components (be careful with the parallel interactions). Probably there is a standard method for solving this (in the textbook from which the exercise comes, maybe) but you could actually attack it with K laws and linear circuit analysis. I'd start with the resistance part (which is straightforward) and then work out the inductive components.