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A boat that can travel at 4.0 km/h in still water crosses a river with a current of 2.0 km/h. At what angle must the boat be pointed upstream (that is, relative to its actual path) to go straight across the river?

A] 27

B] 30

C] 60

D]63

E] 90

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# Homework Help: Question involving the mathematics of physics and trigonometry

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