Shipping rate by distance custom snippet

add_filter('wpali_distance_shipping_rate', 'wpali_add_base_price_to_rate', 10, 2);
function wpali_add_base_price_to_rate($rate, $obj)
{
    if (!empty($rate['meta_data']['value'])) {
        $meters = $rate['meta_data']['value'];
        $distance_in_km = $meters * 0.001;
        if($distance_in_km > 10 ){
            $rate['cost'] = $rate['cost'] + 29;
        }else{
            $rate['label'] = 'Fixed distance rate';
            $rate['cost'] = 29;
        }
    }
    return $rate;
}