How slow will you get if you keep slowing down at your current rate? New Program tells you

Have you ever run a given distance on one day, and then run it slower on the next day, and then wanted to discover how slow you will be in the future if you keep getting slower at the rate you got slower between the two days? A new program you can find at http://www.aspserver444.qsh.eu/3losercalc.htm is just what you need.

I wrote the program in javascript. Perhaps you will be able to alter the source code to create a program that gives more cheerful results.