From two piers, the distance between which 2 km sailed in the opposite direction, two boats, one boat passed 450

From two piers, the distance between which 2 km sailed in the opposite direction, two boats, one boat passed 450 m and the other 350 m, which is now the distance between the boats.

The boats were moving in opposite directions, and each of them covered some distance.

This means that the distance between them has increased by the sum of the distances that they have swum:

1) 450 + 350 = 800 (m) the boats additionally moved away from each other.

There was a distance of 2 km between the boats when they were at the docks. And then the boats moved further 800 m from each other, which means that between them it became:

2) 2 km + 800m = 2 km 800 m (distance) became between the boats.

Answer: 2 km 800 m.