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The correct statement is:
x = 15 ft; the distance from the lighthouse to the ship must be the longest distance
The horizontal distance from the lighthouse to the ship can be found using the Pythagorean theorem:
x^2 = 25^2 - 20^2
x^2 = 625 - 400
x^2 = 225
x = 15 ft
Therefore, the correct answer is x = 15 ft.