What are the sides of this square and this triangle?

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The perimeter of a given triangle, whose sides are in the ratio of \(3 : 4 : 5\), is greater by \(\quantity{4}{ft.}\) than that of a given square. The area of the square is greater by \(\quantity{25}{sq.ft.}\) than that of the triangle. Find the lengths of the sides of the square and of the triangle.