Question 870290
(Q1) A destroyer and a cruiser leave a port at the same time. The destroyer sails at 38 knots on a bearing of 042 degrees and the cruiser sails at 25 knots on a bearing of 315 degrees. How far apart are the ships two hours later?
The destroyer is 76 nm from the start.
The cruiser is 50 nm away.
Those are 2 sides of a triangle, and the included angle is 87 degrees.
Use the Cosine Law to find the distance between them.
{{{c^2 = a^2 + b^2 - 2ab*cos(C)}}}
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(Q2)A control tower observes the flight of an unidentified flying object. At 09:23 the U.F.O. is 580 km away on a bearing of 043 degrees. At 09:25 the U.F.O. is 360 km away on a bearing of 016 degrees. What is the speed and the course of the U.F.O.? 
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Similar to Q1
You have 2 sides and the included angle.