In fact, it is to examine the relationship between three sides of solid geometry and right triangle:

Due east, the inclination of the ship is 30 degrees? So this ship leaves the island √3? H meters (as shown above)

Due south, the inclination of the ship is 45? So this ship left the island? H meters (similar to the above picture)

The two ships are located in the east and south respectively, so the distance between them is 2m (√ [(√ 3) 2+ 1 2] = 2).