Imagine the ships full of breaches and shotholes. In their holds there are pumps, absorbing and spouting the water high up in the sky. Spouted water drops everywhere in the sea, like a rain. It is clear that water in the sea will flow again from the voids, places empty of ships, to the ships again. Everything floating on the water surface will be seized by the water and will be brought to the ships again, where the ships will swallow everything through their holes.
Large ships can also absorb light boats.
A one after another every equal time interval. It is clear that they arrive to the ship B in the same time intervals, but distances between them will be constantly growing. The answer is clear, - the water surface expands. If these motor bouts will sail further then they will arrange in groups but the distances between groups will also grow. If in these bouts there are postmen, then after passing by near a dozen of large ships, some postmen will be absorbed, and the rest will move in groups.