A motorboat, which has a speed of 8.0 meters per second in still water, is headed east as it crosses a river flowing south at 3 meters per second. What is the magnitude of the boat’s resultant velocity with respect to the starting point?

Ibelieve your answer is b.hope this : )

To use anything transparent

The boat's velocity relative to the riverbank can be resolved into two components. the component going north is 2.7 m/s and the component going west is 1.2 m/s.we add these two vectors and then find the magnitude of the resultant to get the speed.the magnitude of the resultant vector from adding can be obtained by the pythagorean theorem.    to two significant figures, the boat's speed relative to the riverbank is 3.0 m/s.