Explanation:
The boat's velocity relative to the water is 6.10 m/s, and the water's velocity relative to the shore is 1.95 m/s. We want the boat's velocity relative to the shore to be perpendicular to the shore.
If we say that θ is the angle the boat makes with the shore, then:
6.10 cos θ - 1.95 = 0
6.10 cos θ = 1.95
cos θ = 1.95 / 6.10
θ = 71.4°
The boat should be steered 71.4° relative to the shore, or 18.6° relative to the vertical.
