Feeling the heat

Two containers container $A$ and container $B$ having an ideal mono-atomic gas are connected by a valve which is initially closed. At this moment their state variables are ${ 10 }^{ 5 }Pa$ , $4\times { 10 }^{ -2 }{ m }^{ 3 }$ , $300K$ and $5\times { 10 }^{ 5 }Pa$ , $16\times { 10 }^{ -2 }{ m }^{ 3 }$ , $400K$ respectively. The valve is opened keeping the temperature of each container same. Find the heat taken out of the system in $KJ$ .

This problem is originally part of set Mechanics problems by Abhishek Sharma .

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