To find the unit rate, we divide the distance by the time in order to find the speed.
Here, the distance is 560 km and the time is 8 seconds.
\[ \text{Unit Rate} = \frac{\text{Distance}}{\text{Time}} = \frac{560 \text{ km}}{8 \text{ secs}} = 70 \text{ km/sec} \]
So, the unit rate is 70 kilometers per second.