Writing a code in military time, and then adding minutes the time i choose.

[irongear]

Hello guys, i am a beginner in programming and i want to write a code for military time and then add minutes to it. In the end i want it to show the original time and then the time after the minutes added!! i would seriously appreciate it if someone showed me a code as an example so i can check the logic and try to understand it. Especially the part where i have to prevent 23:50 hours from going 24:20 if i add 30 minutes...
as an example, when i run the program i want it to be something like this:

Enter a time in the format hour:minute

2:30

The time 50 minutes after 2:30 will be 3:20

thanks alot

[Norm]

Start by doing it manually so you see what steps the program needs to do.
How did you get 3:20 from 2:30?