To calculate the time it takes to travel a certain distance at a constant speed, you can use the formula:
\[ \text{Time} = \frac{\text{Distance}}{\text{Speed}} \]
In your case, the distance is 605 kilometers and the speed is 55 kilometers per hour. Plugging in the values:
\[ \text{Time} = \frac{605 \text{ km}}{55 \text{ km/h}} = 11 \text{ hours} \]
So, it will take 11 hours to travel a distance of 605 kilometers at a speed of 55 km/h.