A boat covers $32 \text{ km}$ downstream in $4 \text{ hours}$ and $14 \text{ km}$ upstream in $7 \text{ hours}$. What is the speed of the boat in still water?
Options:
- A: $4 \text{ km/h}$
- B: $4.5 \text{ km/h}$
- C: $5 \text{ km/h}$
- D: $6 \text{ km/h}$
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