Final pressure after mixing of gas?

A 0.7-L flask of H2(g) at 3 atm and a 4.4-L flask of He(g) at 2.7 atm are connected by a tube of negligible volume. (See the figure below.) A valve on the tube is opened, allowing the gases to mix at constant temperature with no reaction. What is the final pressure? Enter your answer in atmospheres, with two significant figures. (Do not enter units as part of your answer!)