To find the speed of the boat in kilometers per hour, you can use the formula:
\[ \text{Speed} = \frac{\text{Distance}}{\text{Time}} \]
In this case, the distance covered is 10.9 kilometers and the time taken is 2 hours. Plugging in these values:
\[ \text{Speed} = \frac{10.9 \text{ km}}{2 \text{ hours}} = 5.45 \text{ km/h} \]
So, the boat was traveling at a speed of 5.45 kilometers per hour.