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The temperature of the two outer surfaces of a composite slab, consisting of two materials having coefficients of
\( \mathrm{P} \) thermal conductivity \( K \) and \( 2 K \) and thickness \( x \) and \( 4 x \), respectively are \( T_{2} \) and \( T_{1}\left(T_{2}T_{1}\right) \). The rate of heat transfer
W through the slab, in a steady state is \( \left(\frac{A\left(T_{2}-T_{1}\right) K}{x}\right) f \), with \( f \) which equal to
[AIEEE 2004]
(a) 1
(b) \( 1 / 2 \)
(c) \( 2 / 3 \)
(d) \( 1 / 3 \)
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