Question: The line joining P and Q crosses the two parallel lines, as shown in the figure. The point R is d units from P. How

The line joining P and Q crosses the two parallel lines, as shown in the figure. The point R is d units from P. How far from Q should the point S be positioned so that the sum of the areas of the two shaded triangles is a minimum? So that the sum is a maximum?

P S d R

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