The time taken by a boat to travel a certain distance upstream is twice the time taken to travel the same distance downstream. If the speed of the stream is $3 \text{ km/h}$, find the speed of the boat in still water.
Options:
- A: $6 \text{ km/h}$
- B: $9 \text{ km/h}$
- C: $12 \text{ km/h}$
- D: $15 \text{ km/h}$
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