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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exam Other Question

factor the polynomial 4a^2-4ac+4c^2, please

Also factor 16a^2-9c^2 Suppose $2500 is invested at 4% interest, compounded quarterly. How much is the investment worth after 6 years? Round your answer to the nearest cent.