A car travels from City A to City B at a speed of $40 \text{ km/h}$ and returns from City B to City A at a speed of $60 \text{ km/h}$. Find the average speed of the car for the entire 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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