A person travels $120 \text{ km}$ at $40 \text{ km/h}$, $150 \text{ km}$ at $50 \text{ km/h}$, and $80 \text{ km}$ at $20 \text{ km/h}$. Find his average speed for the whole journey.
Options:
- A: $30 \text{ km/h}$
- B: $32 \text{ km/h}$
- C: $35 \text{ km/h}$
- D: $40 \text{ km/h}$
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