The original lay of a rectangular plot ABCD on open ground is 80 m long along AB, and 60 m wide along BC. Concreted pathways are intended to be laid on the inside of the plot all around the sides. The pathways along BC and DA are each 4 m wide. The pathways along AB and DC will mutually be of equal widths such that the un- concreted internal plot will measure three-fourth of the original area of the plot ABCD. What will be the width of each of these pathways along AB and DC?