Gill is now 27 and has moved into a new flat. She has ten pictures to hang in a horizontal row on a wall which is 4800 mm wide. The pictures are identical in size and are 210 mm wide. Gill hangs the first two pictures so that one is on the extreme left of the wall and one is on the extreme right of the wall. She wants to hang the remaining eight pictures so that all ten pictures are equally spaced. How far should Gill place the centre of the third picture from the left from a vertical line down the centre of the wall? 
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