The diagram represents a circuit made up of a cell and three resistors $R_1$, $R_2$ and $R_3$. The cell has electromotive force (e.m.f.) $1.60\,\text{V}$ and negligible internal resistance. The current in the cell is $0.64\,\text{A}$. The potential difference across $R_1$ is $0.48\,\text{V}$. The current in $R_3$ is $0.32\,\text{A}$. Calculate the resistance of $R_2$.
- A$1.5\,\Omega$
- B$2.5\,\Omega$
- C$3.5\,\Omega$
- D$5.0\,\Omega$