5 m3 open tank is used to mix two streams of liquid water. Stream A enters at 90oC at a rate of 3 kg/s. Stream B enters at a rate of 2 kg/s. Assuming that 20 kW of heat is lost to the environment and that the density of water is constant at 1000 kg/m3 what must the temperature of stream B be such that the temperature of the well-mixed result will be 60oC when the tank fills. Assume that atmospheric pressure is 101.325 kPa. Be as accurate as possible when solving this problem.