For the shown figure, calculate the equivalent thermal resistance if the bricks made of the same material of conductivity $K$

815-1017

  • A

    $\frac{l}{{KA}}$

  • B

    $\frac{3l}{{KA}}$

  • C

    $\frac{l}{{3KA}}$

  • D

    $\frac{6l}{{KA}}$

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  • [IIT 2013]