I just wrote a simple GUI in wxPython which calculates speed, distance or time according to the input.
Here is the code-
And, here is what the output looks like-
As you can see, this is a very simple program, see the code, find out how it works and you can modify it yourself too!! Share any of your comment/feedbacks in the comments section below.
PS. Please note that to run the program you will need to have wxPython installed.