A boat crosses a river of width 69.9 m in which the current has a uniform speed of 0.754 m/s. The pilot maintains a bearing (i.e., the direction in which the boat points) perpendicular to the river and a throttle setting to give a constant speed of 2.77 m/s relative to the water. What is the magnitude of the speed of the boat relative to a stationary shore observer?

Answer in units of m/s.