Two closed vessels of same volume are joined through a narrow tube and both vessels are filled with air of pressure 90 kPa and temperature 400 K.…

Two closed vessels of same volume are joined through a narrow tube and both vessels are filled with air of pressure $\displaystyle 90$ kPa and temperature $\displaystyle 400$ K . Keeping the temperature of one vessel constant at $\displaystyle 400$ K the second vessel temperature is raised to $\displaystyle 500$ K . The final pressure in the vessels is $\displaystyle \_\_\_\_$ kPa.