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A boat’s speed in still water is $6 \; \text{km/hr.}$ while river is flowing with speed of $1.2 \; \text{km/hr.}$ and it takes $1$ hour to row to a place and back. How far is the place?

1. $2.88 \; \text{km}$
2. $2.64 \; \text{km}$
3. $1.88 \; \text{km}$
4. $2.76 \; \text{km}$

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