$A$ man swimming in a stream which flows at $1 \frac{1}{2} \text{ km/h}$ finds that in a given time he can swim twice as far with the stream as he can against it. At what rate does he swim? (in $\text{km/h}$)
- A$4 \frac{1}{2}$
- B$5 \frac{1}{2}$
- C$7 \frac{1}{2}$
- DNone of these
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