Answer:
If we need to calculate the 6% increase on speed, we should know how much is that, so we can multiply:
200 * 0.06 = 12
Now, we know the speed increases 12km/h l, so, if we want to know which would be the speed then, we only have to add:
200 + 12 = 212
The speed would be 212 km/h after the increase