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Deck : General Navigation - 1981/2138
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A rotary current sets through all directions of the compass. The time it takes to complete one of these cycles, in a locale off the East coast of the US, is approximately __________.
A) 2 1/2 hours
B) 3 1/2 hours
C) 6 1/4 hours
D) 12 1/2 hours
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