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Coefficient of thermal conductivity

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Coefficient of thermal conductivity of a material is numerically equal to the amount of heat conducted per second normally per unit area of cross section per unit temperature gradient.
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Explain thermal conductivity and coefficient of thermal conductivity. A copper bar of thermal conductivity 401 W (mK) has one end at 104^(@)C and the other end at 24^(@)C . The length of the bar is 0.10 m and the cross- sectional area is 1.0 x 10^(-6)m^(-2) What is the rate of heat conduction , along the bar ?

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

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