Devaanandhan

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';