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I need help with the following question

Two ships A and B are sailing away from the point O along routes such that angle AOB = 120 degrees. How fast is the distance between them changing if, at a certain instant OA = 8 mi. OB = 6 ,i., ship A is sailing at the rate of 20 mi/hr, and ship B at the rate of 30 mi/hr.

I drew an obtuse triangle with the angle 120 degrees. Then I tried using the law of cosines to find the sides. I want to find dY / dt.

Any help is greatly appreciated

Thanks