If two rods of length $$L$$ and $$2 L$$, having coefficients of linear expansion $$\alpha$$ and $$2 \alpha$$ respectively are connected end-to-end, then find the average coefficient of linear expansion of the composite rod.
- A$$\frac{3 \alpha}{2}$$
- B$$\frac{5 \alpha}{2}$$
- C$$\frac{5 \alpha}{4}$$
- D$$\frac{5 \alpha}{3}$$
✓ Correct answer: D
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