Hi, I am having trouble with problems involving vectors:

A power boat crossing a wide river has a compass heading of 25 degrees and a speed relative to the water of 15 mph. The river is flowing in the direction of 135 degrees at 3.9 mph. What is the boat's actual velocity, that is, what is its speed and direction relative to the ground?

A large ship has gone aground in a harbor and two tugs, with cables attached, attempt to pull it free. If one tug pulls with a compass course of 161 degrees and a force of 2900 kg, and a second tug pulls with a compass course of 192 degrees and a force of 3600 kg., what is the compass direction and the magnitude of the resultant force?

I think I am setting both of these problems up right, and doing the math right, but I'm unsure of how to find the angles in the triangle created by the resultant vector.

If some math genius could help me figure this out that would be amazing!!!!!