Road distance distance in two point in google maps

getmap.js

<script type="text/javascript"
        src="https://maps.googleapis.com/maps/api/js?key=AIzaSyAdVNlPdWIf1qPRQfkxgDsxwvcs0EO2I5c&libraries=places"></script>
<script type="text/javascript">
    var autocomplete = new google.maps.places.Autocomplete($("#map")[0], {});
    var autocompleteSecond = new google.maps.places.Autocomplete($("#map2")[0], {});
    var autocompletethird = new google.maps.places.Autocomplete($("#map3")[0], {});

    function initialize() {
        google.maps.event.addListener(autocomplete, 'place_changed', function () {
            fillInAddress();
        });
        google.maps.event.addListener(autocompleteSecond, 'place_changed', function () {
            fillInAddress();
        });
        google.maps.event.addListener(autocompletethird, 'place_changed', function () {
            var place = autocompletethird.getPlace();
        });
    }

    function fillInAddress() {
        var placeOne = autocomplete.getPlace();
        var placeTwo = autocompleteSecond.getPlace();
        var placeone = placeOne.formatted_address;
        var placetwo = placeTwo.formatted_address;
        var directionsService = new google.maps.DirectionsService();
        var request = {
            origin: placeone, // a city, full address, landmark etc
            destination: placetwo,
            travelMode: google.maps.DirectionsTravelMode.DRIVING
        };
        directionsService.route(request, function (response, status) {
            if (status == google.maps.DirectionsStatus.OK) {
                var meter = response.routes[0].legs[0].distance.value; // the distance in metres
                var km = meter / 1000; // the total distance in kilometres
                console.log(km);
            }
            else {
                // oops, there's no route between these two locations
                // every time this happens, a kitten dies
                // so please, ensure your address is formatted properly
            }
        });
    }
</script>