What's the minimum area of this variable triangle?

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\(OABC\) is a square of side \(\quantity{1}{ft.}\). A point \(X\) in \(AB\) and a point \(Y\) in \(BC\) are such that \(AX=\quantity{x}{ft.}\), \(BY=\quantity{kx}{ft.}\) and \(BY\) is longer than \(AX\). For a given value of \(k\), show that the minimum area of the triangle \(OXY\) is \[\quantity{\frac{4k-1}{8k}}{sq.ft.}\]