The distance between the ship and the light house is 139.28 km.
Solution:
The given image shows, it is right triangle.
Height = 50 km
Base = 130 km
Hypotenuse = ?
Using Pythagoras theorem,
In right triangle, square of the hypotenuse is equal to the sum of the squares of the other two sides.



Taking square root on both sides, we get
Hypotenuse =

Hypotenuse = 139.28 km
The distance between the ship and the light house is 139.28 km.