A person covers the three equal sides of an equilateral triangular path at speeds of $10 \text{ km/h}$, $20 \text{ km/h}$, and $30 \text{ km/h}$ respectively. Find his average speed for the entire journey.

Options:

• A: $15 \text{ km/h}$
• B: $16 \frac{4}{11} \text{ km/h}$
• C: $18 \text{ km/h}$
• D: $20 \text{ km/h}$

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