Two batteries with e.m.f 12 V and 13 V are connected in parallel across a load resistor of

Two batteries with e.m.f $12 \mathrm{~V}$ and $13 \mathrm{~V}$ are connected in parallel across a load resistor of $10 \Omega$. The internal resistances of the two batteries are $1 \Omega$ and $2 \Omega$ respectively. The voltage across the load lies between.