Calculating between two distance from database

gistfile1.txt

Hi, i am doing a tour planner web based. I try using this formula but i am having problem because in google map when i test this two location, it shows 11 min but when i use this, it showing me 200+ hours. Please do need some assistance

Here is my example code :
a_lat = '3.159583';
a_lon = '101.717955';

b_lat = '3.160384';
b_lon = '101.736396';

 	

function getDistanceFromLatLonInKm(lat1,lon1,lat2,lon2) {
  var R = 6371; // Radius of the earth in km
  var dLat = deg2rad(lat2-lat1);  // deg2rad below
  var dLon = deg2rad(lon2-lon1); 
  var a = 
    Math.sin(dLat/2) * Math.sin(dLat/2) +
    Math.cos(deg2rad(lat1)) * Math.cos(deg2rad(lat2)) * 
    Math.sin(dLon/2) * Math.sin(dLon/2)
    ; 
  var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a)); 
  var d = R * c; // Distance in km
  return d;
}

function deg2rad(deg) {
  return deg * (Math.PI/180)
}

distance = getDistanceFromLatLonInKm(a_lat, a_lon, b_lat, b_lon);