getDurations() {
    this.geolocation.getCurrentPosition().then((position) => {
      this.start.latitude = position.coords.latitude;
      this.start.longitude = position.coords.longitude;
      let uber_link = "https://api.uber.com/v1.2/estimates/price?start_latitude=" + this.start.latitude + "&start_longitude=" + this.start.longitude + "&end_latitude=" + this.stop.latitude + "&end_longitude=" + this.stop.longitude;
      let maps_link = "https://maps.googleapis.com/maps/api/distancematrix/json?origins=" + this.start.latitude + "," + this.start.longitude + "&destinations=" + this.stop.latitude + "," + this.stop.longitude + "&mode=walking&language=fr-FR&key=AIzaSyBscbZVSgZLlBOioFlcaYdXDZQ9tUNXfX4";
      let maps_link_car = "https://maps.googleapis.com/maps/api/distancematrix/json?origins=" + this.start.latitude + "," + this.start.longitude + "&destinations=" + this.stop.latitude + "," + this.stop.longitude + "&language=fr-FR&key=AIzaSyBscbZVSgZLlBOioFlcaYdXDZQ9tUNXfX4";
      let headers = new Headers();
      headers.append("Authorization", "Token UbD_Cz-HqZirZHA1_Ys-hDj5ojeZttX3YkY-BDH_");
      headers.append("Accept-Language", "fr_FR");
      this.http.get(uber_link, { headers: headers })
        .map(response => response.json())
        .subscribe(data => {
          this.uber_duration = data.prices[0].duration / 60 + "";
          this.uber_price = data.prices[0].estimate;
          var price = this.uber_price.slice(4, 7);
          var start_price = this.uber_price.slice(0, 2);
          this.uber_price = start_price + price + " €";
        })
      this.http.get(maps_link)
        .map(response => response.json())
        .subscribe(data => {
          if (data.rows[0].elements[0].duration)
            this.maps_duration_walk = data.rows[0].elements[0].duration.text
        })
      this.http.get(maps_link_car)
        .map(response => response.json())
        .subscribe(data => {
          if (data.rows[0].elements[0].duration)
            this.maps_duration_car = data.rows[0].elements[0].duration.text
        })
    });
  }