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A $15 \; \text{km}$ long road can be made by $20$ men in $18$ days. What is the length of the road that can be made by $15$ men in $12$ days ?

1. $6 \; \text{km}$
2. $6.5 \; \text{km}$
3. $7.5 \; \text{km}$
4. $8 \; \text{km}$

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