exam Maths Puzzle Numerical Ability

A sailboat travels 20 miles downstream in 3 hours.It returns in 4 hours. Find the speed of the sailboat in still water and the rate of the current.

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Can you please show me how solve this equation -5y = y + 6 A 60cm length of rope is to be cut into two pieces to form the perimeters of two squares. If the total area of the two squares is to be a minimum, what are the dimensions of the squares?