diff --git a/js/h5p-x-api-event.js b/js/h5p-x-api-event.js
index acaed22..98b287a 100644
--- a/js/h5p-x-api-event.js
+++ b/js/h5p-x-api-event.js
@@ -19,7 +19,7 @@ H5P.XAPIEvent.prototype.constructor = H5P.XAPIEvent;
  * @param {number} score
  * @param {number} maxScore
  */
-H5P.XAPIEvent.prototype.setScoredResult = function (score, maxScore) {
+H5P.XAPIEvent.prototype.setScoredResult = function (score, maxScore, instance) {
   this.data.statement.result = {
     'score': {
       'min': 0,
@@ -27,6 +27,15 @@ H5P.XAPIEvent.prototype.setScoredResult = function (score, maxScore) {
       'raw': score
     }
   };
+  if (maxScore > 0) {
+    this.data.statement.result.score.scaled = Math.round(score / maxScore * 10000) / 10000;
+  }
+  if (instance && instance.activityStartTime) {
+    var duration = Math.round((Date.now() - instance.activityStartTime ) / 10) / 100;
+    // xAPI spec allows a precision of 0.01 seconds
+    
+    this.data.statement.result.duration = 'PT' + duration + 'S';
+  }
 };
 
 /**
diff --git a/js/h5p-x-api.js b/js/h5p-x-api.js
index ea5ba79..e287c1a 100644
--- a/js/h5p-x-api.js
+++ b/js/h5p-x-api.js
@@ -82,10 +82,14 @@ H5P.EventDispatcher.prototype.triggerXAPICompleted = function (score, maxScore)
  */
 H5P.EventDispatcher.prototype.triggerXAPIScored = function (score, maxScore, verb) {
   var event = this.createXAPIEventTemplate(verb);
-  event.setScoredResult(score, maxScore);
+  event.setScoredResult(score, maxScore, this);
   this.trigger(event);
 };
 
+H5P.EventDispatcher.prototype.setActivityStarted = function() {
+  this.activityStartTime = Date.now();
+};
+
 /**
  * Internal H5P function listening for xAPI completed events and stores scores
  *