A freight train leaves city \(\mathrm{A}\) and heads for city \(\mathrm{B}\), which is \(44 \mathrm{~km}\) away, at \(12 \mathrm{~km} / \mathrm{hr}\). At the same time, a passenger train leaves city \(\mathrm{B}\) and heads for \(\mathrm{A}\). The two trains barely avoid a collision at a station exactly \(12 \mathrm{~km}\) from city A. At what constant velocity was the passenger train traveling? \(\cdot\)॰