question on work

1. The problem statement, all variables and given/known data

"An insulated box is initially divided by a frictionless, thermally conducting piston. One side of the piston is 1.5(m^3) of air at 400k, 4bar. The other side is 1.5(m^3) of air at 400K,2 bar
The piston is released and equilibrium is attained, with the piston experiencing no change of state"

the solution assumes W=0. why is this?

2. Relevant equations

3. The attempt at a solution

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