There is a fishing boat, with a ladder in it, leaning against a wall at the harbor. There are five oars and two fishing nets in the boat. The distance between two consecutive steps on the ladder is 1 foot. If waves lashing against the wall rise a half foot in every half hour, in how much time will six steps of the ladder go under the waves?

The steps of the ladder will never go under the waves.

Explanation:

The six steps of the ladder will never go under the waves lashing against the wall. The reason for this is because for every half hour that the waves lashing against the wall rises a half foot, the fishing boat also rises a half foot with the waves. Therefore, none of the six steps of the ladder will go under the waves.