In a $1000 \text{ m}$ race, A gives B a start of $200 \text{ m}$ and still beats him by $20 \text{ seconds}$. If A's speed is $10 \text{ m/s}$, what is B's speed?

Options:

• A: $5 \text{ m/s}$
• B: $6 \frac{2}{3} \text{ m/s}$
• C: $7.5 \text{ m/s}$
• D: $8 \text{ m/s}$

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