Water at an average temperature of 300 K flows at 0.7 kg/s in a 2.5-cm-diameter tube 6

Question:

Water at an average temperature of 300 K flows at 0.7 kg/s in a 2.5-cm-diameter tube 6 m long. The pressure drop is measured as 2 kPa. A constant heat flux is imposed, and the average wall temperature is 55oC. Estimate the exit temperature of the water.