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The overall thermal resistance in K/W is    

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Heat flows through a composite slab and shown below. The depth of the slab is 1 m. The k values are in W/m.K. The overall thermal resistance in K/W is

            

      (a) 17.2                                                               (b) 21.9

      (c) 28.6                                                               (d) 39.2

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