If a person walks at $3 \text{ km/h}$, he is $15 \text{ minutes}$ late for his destination. If he walks at $4 \text{ km/h}$, he reaches $15 \text{ minutes}$ early. Find the distance to his destination.
Options:
- A: $5 \text{ km}$
- B: $6 \text{ km}$
- C: $8 \text{ km}$
- D: $9 \text{ km}$
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