2 wire dc ring main distributor based problem

A 2-wire d.c. distributor ABCDEA in the form of a ring main is fed at point A at 220 V and is loaded as under : 10A at B ; 20A at C ; 30A at D and 10 A at E. The resistances of various sections (go and return) are : AB = 0•1 Ω ; BC = 0•05 Ω ; CD = 0•01Ω ; DE = 0•025 Ω and EA = 0•075 Ω. Determine : (i) the point of minimum potential (ii) current in each section of distributor