exam Maths Puzzle Numerical Ability

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?

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exam Other Question

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. which is an equation of the axis of symmetry of the grapd y=x^2-4x+1?