Cells $X$ and $Y$ are joined in series with a resistor of resistance $9.0\,\Omega$, as shown. Cell $X$ has an electromotive force (e.m.f.) of $1.0\,\text{V}$ and an internal resistance of $1.0\,\Omega$. Cell $Y$ has an e.m.f. of $2.0\,\text{V}$ and an internal resistance of $2.0\,\Omega$. What current flows in the circuit?
- A$0.25\,\text{A}$
- B$0.17\,\text{A}$
- C$0.10\,\text{A}$
- D$0.083\,\text{A}$