In a pipe \(0.3 \mathrm{~m}\) in diameter, \(0.3 \mathrm{~m}^{3} / \mathrm{s}\) of water are pumped up a hill. On the hilltop (elevation 48), the line reduces to \(0.2 \mathrm{~m}\) diameter. If the pump maintains a pressure of \(690 \mathrm{kPa}\) at elevation 21 , calculate the pressure in the pipe on the hilltop.