In a double-pipe exchanger hot water (5000 kg/h) is cooled from 95 °C to 65 °C; 50 000 kg/h of cooling water enters at 30 °C; U = 2270 W/m^{2}·K; c_{p} = 4.2 kJ/kg·K. Determine the cooling-water outlet temperature. (answer in °C)