combining functions of Twitter and Google Map

Our client wants to combine the function of Twitter and Google, and we need professional programmers to see if this is something doable: They are a mobile food service company so they will constantly changing their food truck location. Therefore, to easily inform the consumers their location, they would like to tweet their location and it will appear on Google map through? their web site? simultaneously. Please let us know the cost and time for this project. Thank you.