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The temperature of the two outer surface...

The temperature of the two outer surfaces of a composite slab, consisting of two materails having coefficients of two materails having coefficients of termal conductivity K and 2K and thickness x and 4x, respectively, are T_2 and `T_1(T_2gtT_1)`. The rate of heat transfer through the slab, in a steady state is `((A(T_2-T_1)K)/x)f`, with f equal to

A

1

B

`1//2`

C

`2//3`

D

`1/ 3`

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