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Statement I alone: The downstream speed of the boat can be calculated as: 
Since downstream speed = B+C, where C=3 km/h: B+3=12 = B = 9 km/h Statement I alone is sufficient to find the speed of the boat in still water. Statement II alone: It states that the boat takes 6 hours to travel 54 km upstream but does not specify the speed of the current. Therefore, it is not possible to calculate the speed of the boat without knowing the current speed. Statement II alone is not sufficient. Combining both statements: Statement I already gives the speed of the current, and thus, using either statement independently (as long as we have the current speed from statement I) is sufficient. Hence, Only statement I alone is sufficient to answer the question.
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