$A$ boat moves downstream at the rate of $1 \, km$ in $7 \frac{1}{2} \, \text{minutes}$ and upstream at the rate of $5 \, km/h$. What is the speed (in $km/h$) of the boat in still water?
- A$6 \frac{1}{2}$
- B$8$
- C$4$
- D$3 \frac{1}{2}$
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