As two boats approach the marina, the velocity of boat 1 relative to boat 2 is 2.5m/s in a direction 47.0° east of North. if boat 1 has a velocity that is 0.775m/s due north, what is the velocity (magnitude and direction) of boat 2?
sketch the diagram. You have one angle, two sides.
You can use law of sines to find another angle, then laws of cosines/sines to find other angles and sides. Or you can do it analytically.
V1 + V2 = V12
where V12=2.5@47E of N
and V1=.775 N
if you break these into N, E components then you can solve for V2 in N,E components