A man travels half of his journey at $40 \text{ km/h}$ and the remaining half at $60 \text{ km/h}$. Find his average speed for the whole journey.
Options:
- A: $48 \text{ km/h}$
- B: $50 \text{ km/h}$
- C: $52 \text{ km/h}$
- D: $54 \text{ km/h}$
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