The three rowed their boat towards the ship. Even before they were half-way there, a gigantic bird swooped down on them and plucked them up. They were carried to a distant land where they were deposited in a nest high in a tree.

From the statements that follow, what was the wing span of the gigantic bird and how far did it carry the three sailors?

1. If the wingspan of the gigantic bird was either 20 or 30 metres wide, it carried the three sailors for 50 leagues.
2. If the gigantic bird carried the three shipmates 75 leagues, its wingspan was not 40 or 50 metres wide.
3. If the wingspan of the gigantic bird was 40 or 50 metres wide, it carried the three sailors 75 leagues.
4. If the gigantic bird's wingspan was not 40 or 50 metres wide, then it was 20 or 30 metres wide.