The speed of a boat in still water is $10 \text{ km/h}$ and the speed of the stream is $2 \text{ km/h}$. Find the total time taken by the boat to travel $48 \text{ km}$ upstream and return back.
Options:
- A: $8 \text{ hours}$
- B: $9 \text{ hours}$
- C: $10 \text{ hours}$
- D: $12 \text{ hours}$
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