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A composite rod made of three rods of eq...

A composite rod made of three rods of equal length and cross-section as shown in fig. The thermal conductivites of the materials of the rods are `K//2`, `5K` and `K` respectively. The end `A` and end `B` are at constant tempertures. All heat entering the face `A` goes out of the end `B` there being no loss of heat from the sides of the bar. The effective thermal conductivity of the bar is

A

A) `15K//16`

B

B) `6K//13`

C

C) `5K//16`

D

D) `2K//13`

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