Question 2
A grass path surrounds a rectangular asphalt playground with dimensions $36$ dm and $12$ m (as in the figure). The width $d$ of the path equals one quarter of the semi-perimeter of the playground. How many metres of wire are needed to fence the grass path from the playground, if it is wound around with $5$ rows of wire? How many posts are needed to fasten the fence, if the distance between any two neighbouring posts is $6$ dm?
