Add the following method to the TimeSpan class:
public void add(TimeSpan span)
Adds the given amount of time to this time span.
Recall the TimeSpan code from this chapter:
public class TimeSpan {
private int hours;
private int minutes;
public void add(int hours, int minutes) { ... }
public int getHours() { ... }
public int getMinutes() { ... }
public String toString() { ... }
// your code goes here
}

An open feedwater heater operates at steady state with liquid entering at inlet 1 with t? = 40°c and pl = 1 .2 mpa. water vapor att2-200°c and p2 = 1.2 mpa enters at inlet 2. saturated liquid water exits with a pressure of pa 1.2 mpa. neglect heat transfer with the surroundings and all kinetic and potential energy effects, determine the mass flow rate of steam at inlet 2 if the mass flow rate of liquid water at inlet 1 is given as 2 kg/s.