A wall has two layers A and B, each made of different materials. The thickness of both the layers is the same. The thermal conductivity of A, KA=3KB. The temperature across the wall is 20∘ C. In thermal equilibrium
A the temperature difference across A=15∘C
B rate of heat transfer across A is more than across B
C rate of heat transfer across both is same
D temperature difference across A is 5∘ C