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If the walls are in series then the heat currents established in both thew walls should be equal.
Let the temp. at A=0(say) , B=35( to maintain the temp. difference of 35 b/w the walls) and T (say across the layer)
= dQ1/dt =dQ2/dt
= (3K)A(T-0) / 10 = (K)A(35-T) / 20
= (6K)A(T)= (K)A(35-T)
= (6K) = (35-T)
=>7T=35
=> T= 5 -----------(ans)
let the temp. at A=0(say) , B=35( to maintain the temp. difference of 35 b/w the walls) and T (say across the layer)
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