1. The problem statement, all variables and given/known data A river is flowing 4.0 m/s to the east. A boater on the south shore plans to reach a dock on the north shore 30.0 Degrees downriver by heading directly across the river. What should be the boat's speed relative to the water? Also, what's the boat's speed relative to the dock? 2. Relevant equations Not sure. 3. The attempt at a solution I have no idea whatsoever how to do this.