Across a shock wave in a gas flow there is a great change in gas density \(ho\). If a shock wave occurs in a duct such that \(V=660 \mathrm{~m} / \mathrm{s}\) and \(ho=1.0 \mathrm{~kg} / \mathrm{m}^{3}\) before the shock and \(V=250 \mathrm{~m} / \mathrm{s}\) after the shock, what is \(ho\) after the shock?