OverPass API - SpeedLimit around a co-ordinates

We are developing an application , that needs to find the speed around a specific location... We were planning to use OverPass API to first the speed and triedn to follow the article mentioned below

http://stackoverflow.com/questions/34860208/overpass-api-speedlimit-around-a-co-ordinates

The syntax of the around method is shown belwo

http://www.overpass-api.de/api/xapi?[maxspeed=][around=2500,8.5580957,76.880541]

but we are not getting any results... Can any one guide us if the syntax is correct

Thanks in Advance