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Two slabs A and B of equal surface area are placed one over the other such that their surfaces are completely in contact. The thickness of slab A is twice that of B. The coefficient of thermal conductiviy of slab A is twice that of B. The first surface of slab A is maintained at 100C, while the second surface of slab B is maintained at 25. The temperature at the contact of their surfaces is

(1)15C(2)45C(3)55C(4)85

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