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Two containers of equal volume contain the same gas at pressures \( P_{1} \) and \( P_{2} \) and absolute temperatures \( T_{1} \) and \( T_{2} \)
\( \mathrm{P} \) respectively. On joining the vessels, the gas reaches a

W common pressure \( P \) and common temperature \( T \). The ratio \( P / T \) is equal to
(a) \( \frac{P_{1}}{T_{1}}+\frac{P_{2}}{T_{2}} \)
(b) \( \frac{P_{1} T_{1}+P_{2} T_{2}}{\left(T_{1}+T_{2}\right)^{2}} \)
(c) \( \frac{P_{1} T_{2}+P_{2} T_{1}}{\left(T_{1}+T_{2}\right)^{2}} \)
(d) \( \frac{P_{1}}{2 T_{1}}+\frac{P_{2}}{2 T_{2}} \)
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