exam Maths Puzzle Numerical Ability

Two points P and Q lie on opposite sides of a line L. Find on L the point A for which the difference AP-AQ is the largest. Show the proof.

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the perimeter of a square mirror is 80cm. what is the area of the mirror (in square cm) a boat can go 60 mph in still water . it takesas long to go 560 miles upstream as it does to go downstream 640 miles. how fast is the current?