Posted by jonathan on Sunday, February 24, 2008 at 9:16pm.
looks like a straightforward application of the cosine law.
120^2 = 90^2 + 135^2 - 2(90)(135)cosß
where ß is the angle between them
Ship A went 30 * 3 = 90 km
Ship B went 45 * 3 = 135 km
So we have a triangle with legs of 90 and 135 and an opposite side of 120
Use the law of cosines
120^2 = 90^2 + 135^2 - 2*90*135 cos T
solve for T
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