Travel Calculator

Looking for a script to base a new script on. I want to make a travel-time calculator. You choose a (predefined) origin and a (predefined) destination, and it rolls a predetermined calculation (such as "New York" and "Southhampton" calculation is: 3+1d6 (days)). There would be 21 possible combinations. Thoughts? Thanks!

I just calculate this in session with a ruler on an overland map.  Why would there be a variable?  Its not like there is excessive traffic on I-95.  

This is for a steamship on the open sea in 1925. There are delays, weather, etc. As timing is an issue in the game, I want the variables.

If you know all the locations ahead of time, you could do it with simple Roll Query for the base travel time and a multiplier for how much longer it will take. [[floor(?{Route|A->B,[A->B] 3|A->C,[A->C] 5|B->C,[B-C] 3} * (1 + (0.1*(1d20-1))))]] Days Travel If you wanted to script it, I'm not sure there's a good script to start with as a base, unless you haven't done any Roll20 API scripts, in which case I have a few links I'd suggest.

There is a script card script that does this. 

Thanks! No I have not yet created an API script. What is the name/where is the script card?