How to Parsing json from Google map distance matrix responce.

Here is my code to parse
let url = "https://maps.googleapis.com/maps/api/distancematrix/json?units=imperial&origins=\(parameters["cur_latitude"]!),\(parameters["cur_longitude"]!)&destinations=\(parameters["des_latitude"]!),\(parameters["des_longitude"]!)&key=\(parameters["mapAPIKEy"]!)"

print("All service list URL===== \(url)");

Alamofire.request(.GET, url, parameters: nil,
headers: postheaders)
.response { request, response, data, error in

let myData = try NSJSONSerialization.JSONObjectWithData(data!,
options: NSJSONReadingOptions.MutableContainers) as! NSDictionary

print("All service listWS ===== \(myData)")
successCallback(result: myData)


}

and on "successCallback" i am getting the below responce

"destination_addresses" = (
"Unnamed Road - Sharjah - United Arab Emirates"
);
"origin_addresses" = (
"Unnamed Road - Dubai - United Arab Emirates"
);
rows = (
{
elements = (
{
distance = {
text = "42.7 mi";
value = 68744;
};
duration = {
text = "49 mins";
value = 2947;
};
status = OK;
}
);
}
);
status = OK;
}

How will i parse and get the distance text from this json ? that is rows-> elements -> distance-> text

I tried this but no luck

successCallback (result : AnyObject){

print("navigation window\(result["rows"])") // this one prints data inside "elements = " tags

let twDataArray = (result as! NSDictionary) as Dictionary

print("navigation window\(twDataArray["rows"]?["elements"])") // Nothing is printing here