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Mathematics 4 Online
OpenStudy (anonymous):

Two submarines, one cruising at 25 knots and the other at 20 knots, left a naval base at the same moment. Three hours later they were 100 nautical miles apart. What was the measure between their courses? (1 knot = 1 nautical mile per hour) 48˚ 85˚ 95˚ 132˚

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