Water (specific heat, c_p = 4.18 kJ/kgK) enters a pipe at a rate of 0.01 kg/s and a temperature of 20°C. The pipe, of diameter 50 mm and length 3 m, is subjected to a wall heat flux q"_w in W/m².

If q"_w = 5000 and the convection heat transfer coefficient at the pipe outlet is 1000 W/m²K, the temperature in °C at the inner surface of the pipe at the outlet is