Two point charges \(8\,\mu C\) and \(-2\,\mu C\) are located at \(x = 2\,\text{cm}\) and \(x = 4\,\text{cm}\), respectively on the \(x\)-axis. The ratio of electric flux due to these charges through two spheres of radii \(3\,\text{cm}\) and \(5\,\text{cm}\) with their centers at the origin is ________.