1. The problem statement, all variables and given/known data Question C(ii) 2. Relevant equations dQ/dt =-kA(dθ/dx) dQ/dt = (θ1-θ2)/ ((lx/kxAx)+ (ly/kyAy)) 3. The attempt at a solution So the first time I tried at this question, I was using the second equation provided above,but when I check the answer, they put the area on the numerator. which left me wonder, how did they make it on top, I've check my textbook but none of it give any clues. If area is on the numerator with θ, I think k should be too isnt it?