A car travels from point A to point B at a speed of $50 \text{ km/h}$ and returns to point A at a speed of $75 \text{ km/h}$. What is the average speed for the entire journey?
Options:
- A: $60 \text{ km/h}$
- B: $62.5 \text{ km/h}$
- C: $65 \text{ km/h}$
- D: $67.5 \text{ km/h}$
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