Under the same load, wire A having length 5.0 m and cross section $2.5\times {10}^{-5}{\mathrm{m}}^2$ stretches uniformly by the same amount as another wire B of length 6.0 m and a cross section of $3.0\times {10}^{-5}{\mathrm{m}}^2$ stretches. The ratio of the Young’s modulus of wire A to that of wire B will be: