Use operator overload concept to create the operations of addition and subtraction on time.

For example, if my job took me 2 hours and 30 minutes (time1) to complete yesterday
and it took me 3 hours and 45 minutes (time2) to complete this morning. 
How do I add them together with the statement  total_time = time1 + time2 ?
How much longer time did I take it today than yesterday?  difference_time = time2 - time1

Procedure:

1. Declare a class called Time that have two public data members, hours and minutes. 
A constructor is created.  Also, there is a method called print which will print
data members in the format as hours : minutes. For example, 9:23, 3:40, ...etc.

2. Declare an operator overload + as a general function that will add two objects of Time and return the total time as an object.

3. Declare an operator overload- as a general function that will subtract two objects of Time and return the difference time as an object.

4. Write a main function to use what you designed.