added getTravelTime()

be-graphes-model/src/main/java/org/insa/graphs/model/Path.java

@@ -228,8 +228,7 @@ public class Path {
      * @deprecated Need to be implemented.
      */
     public double getTravelTime(double speed) {
-        // TODO:
+        return (this.getLength()/speed);
-        return 0;
     }
 
     /**