The following timer class measures the total time that has elapsed after timing a number of events. Your job is to implement the add method so that it correctly updates the hours and minutes fields. For example, consider this sequence of statements:

Timer t = new Timer();
t.add(40); // 40 minutes
t.add(50); // another 50 minutes
System.out.println(t.getTotal()); // prints 1:30, one hour and 30 minutes