The wire RST is joined to a second wire XY, as illustrated. Each wire has length $100\,\text{cm}$ and a resistance per unit length of $10\,\Omega\,\text{m}^{-1}$. Calculate the total resistance between X and Y.
- A$3.3\,\Omega$
- B$5.0\,\Omega$
- C$8.3\,\Omega$
- D$13.3\,\Omega$