Suppose the river is moving east at 4.80 km/h and the boat is traveling Theta = 43.0° south of east with respect to the Earth. You will have to solve two equations and 2 unknowns. (a) Find the speed of the boat with respect to the Earth. kh/m (b) Find the speed of the boat with respect to the river if the boat's heading in the water is 60° south of east. km/h I am having trouble on where to start and what to do. I tried sqrt((4.80(cos43*))^2 + (4.80(sin43*))^2) but still give a wrong answer.