A 40 gallon electric water heater is used to heat tap water 10C. The heating level is set to the maximum level while several people take consecutive showers. If, at the maximum heating level, the heater uses 5 kW of electricity, and the water use rate is a continuous 2.7 gallons/min, what will be the temperature of the water exiting the heater (in C) ? Assume that the system is at unsteady state and that the heater is 90% efficient; that is, it has flaws on its isulation, and not all the energy suppllid heats th water