k = Q⋅dA⋅ΔT⋅t\frac{Q\cdot d}{A\cdot \Delta T\cdot t}A⋅ΔT⋅tQ⋅d
d = thickness = 3m
A = 9m2^{2}2
Q = 288kJ = 288000J, t = 7200s, ΔT = 90ºC/m → 90K/m x 3 = 270K
k = 288000×39×270×7200\frac{288000 \times 3}{9 \times 270 \times 7200}9×270×7200288000×3
k = 4.93 x 10−2^{-2}−2Wm−1^{-1}−1k−1^{-1}−1
