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A Girl Who Can Row 4.2 km/h4.2 \mathrm{~km} / \mathrm{h} In Still Water Wants to Get Across a River by Still

Question 8

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A girl who can row 4.2 km/h4.2 \mathrm{~km} / \mathrm{h} in still water wants to get across a river by the shortest route possible. The river is flowing at 3.1 km/h3.1 \mathrm{~km} / \mathrm{h} . At what angle upstream from straight across the river should she head?

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