Shayari Bazar

There is a row of soldiers that is 1km in length and they walk with a constant speed in a straight line, in one direction. All the way at the end walks a messenger. He has to bring a message to the captain walking all the way at the beginning of the row. The messenger starts walking past the soldiers and immediately turns around when arriving at the captain and walks back to the end of the row. When the messenger is back at the end, the whole group of soldiers have traveled a distance of 1 km. The soldiers and captain are walking at the same constant speed. The messenger (walking faster then the soldiers) is also walking a a constant speed. You don’t know anything about time or speed. How far did the messenger travel from the end of the row to the beginning and back?