title: Optaplanner CVRPTW example clarification
body: <p>I am trying to understand the Optaplanner CVRPTW example and have the below questions:</p>
  
  <ol>
  <li>Does every node require both distance and travel time to every other node? Or it just requires any one of them? Example data set does not contain both of them. I think it uses euclidean formula to calculate the distance, but how does it automatically calculate travel time?</li>
  <li>Is it possible to use real time data (precalculated road distance data)?</li>
  </ol>