The shape of the Instantaneous Unit Hydrograph (IUH) of a catchment is an isosceles triangle with a peak of 60 m\(^3\)s\(^{-1}\) and time to peak of 3 h. If the constant baseflow is 7.5 m\(^3\)s\(^{-1}\), the peak of the 3-h Unit Hydrograph (UH) in m\(^3\)s\(^{-1}\) is