Answer:
If a person rows a boat directly west of a stream that flows south, the resultant velocity of the boat will depend on the speed and direction of the stream and the speed at which the person is rowing.
If the person is rowing faster than the speed of the stream, the resultant velocity of the boat will be in a direction between west and southwest. This is because the velocity of the stream is directed towards the south, and the velocity of the boat is directed towards the west. The resultant velocity will be the vector sum of these two velocities, which will have a direction between the two velocities.
However, the exact direction of the resultant velocity will depend on the specific speeds and angles involved.