Flask Q has $5\,\text{dm}^3$ of helium at a pressure of $12\,\text{kPa}$. Flask R has $10\,\text{dm}^3$ of neon at a pressure of $6\,\text{kPa}$. When the flasks are joined together at constant temperature, what will the final pressure be?
- A$8\,\text{kPa}$
- B$9\,\text{kPa}$
- C$10\,\text{kPa}$
- D$11\,\text{kPa}$