Question 897789
Along the length is simple to find.  Cut the 60 into 6 parts, and you put 10+1 on each LENGTH, being here 22 pillars.


Be aware that the ends of each width now have their pillars already.


Width:  {{{2880/60=288/6=144/3=12*3*4/3=48}}};
The width of the garden is 48 meters.
Cut 48 into increments of 6, and there are 8 of these increments.  If placing pillars on all these width locations would be 9; but 2 on each width are already placed.  This means you place 9-2=7 pillars on each width, or because TWO widths make the garden, 14 pillars.


Total count of pillars, {{{22+14=highlight(36)}}}.