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A boat, whose speed in still water is 2.40 m/s , must cross a 285-m-wide river...

A boat, whose speed in still water is 2.40 m/s , must cross a 285-m-wide river and arrive at a point 118 m upstream from where it starts (Figure 1). To do so, the pilot must head the boat at a 45∘ upstream angle.

What is the speed of the river's current?

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