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A metal rod A of length l(0) expands by ...

A metal rod `A` of length `l_(0)` expands by `Deltal` when its temperature is raised by `100^(@)C`. Another rod `B` of different metal of length `2l_(0)` expands by `Deltal//2` for same rise in temperature. `A` third rod `C` of length `3l_(0)` is made up of pieces of rods `A` and `B` placed end to end expands by `2Deltal` on heating through `100K` . The length of each portion of the composite rod is :-

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