This is an Amazon Alexa skill.
It's relatively simple, it uses the Google Maps API and Alexa Skills Kit SDK for Node.js to tell the user the driving distance and time between any two U.S. cities.
Relevant resources:
https://github.com/moshen/node-googlemaps
https://github.com/alexa/alexa-skills-kit-sdk-for-nodejs
https://en.wikipedia.org/wiki/List_of_United_States_cities_by_population