In vessel A with volume V₁ = 2l, there is a gas under pressure p₁ = 3 * 10⁵Pa; and in the vessel B with the volume V₂ = 4l there is the same gas under pressure p₂ = 1 * 10⁵Pa. The temperature of both vessels is the same and constant. Under what pressure p will be the gas after connecting the vessels A and B with a tube. The volume of the connecting tube is neglected.

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