A train $250 \text{ m}$ long completely passes a man walking in the same direction at $5 \text{ km/h}$ in $15 \text{ seconds}$. Find the speed of the train.
Options:
- A: $60 \text{ km/h}$
- B: $65 \text{ km/h}$
- C: $70 \text{ km/h}$
- D: $75 \text{ km/h}$
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