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speed of boat in still water

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Debbie traveled by boat 5 miles upstream to fish in her favorite spot. Because of the 4-mph current, it took her 20 minutes longer to get there than to return. How fast will her boat go in still water?

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The solution is comprised of detailed solution on the calculation of the speed of boat in still water when the current flow is present.

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Assume her speed in the still water is x ...

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