Two(2) Batteries A & B Connected In Parallel

2 batteries A & B are connected in parallel & a load of 10Ω is connected across their terminals. A=20V & I.resistance of 2Ω; B=12V & I.resistance of 1Ω i) Apply Kirchhoff's laws to determine the values & directions of currents in A, B & external resistance ii) Determine the p.d across the external resistance