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Two rods whose lengths are l1 and l2 an...

Two rods whose lengths are `l_1` and `l_2` and heat conductivity coefficient `x_1` and `x_2` are placed end to end. Find the heat conductivity coefficient of a uniform rod of length `l_1 + l_2` whose conductivity is the same as that of the system of these two rods. The lateral surfaces of the rods are assumed to be thermally insulated.

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The correct Answer is:
`[x=(l_(1)+l_(2)(l_(1)lx_(1)+l_(2)lx_(2))]`
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