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  3. a boat makes a 120-mile trip downstream in 3 hours

A boat makes a 120-mile trip downstream in 3 hours but makes the return trip...

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A boat makes a 120-mile trip downstream in 3 hours but makes the return trip in 4 hours. If b = the rate of the boat in still water and c = the rate of the current, which of the following equations represents the trip downstream?4(b + c) = 1203(b-c) = 120O3(b + c) = 120

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