$A$ motorist covered the first $20 \text{ km}$ of his journey in $30 \text{ minutes}$ and the remaining $29 \text{ km}$ in $40 \text{ minutes}$. His average speed in $\text{km/hr}$ is:
- A$41 \frac{3}{4}$
- B$42$
- C$49$
- D$57 \frac{1}{6}$
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