Here we see top views of three motorboats crossing a river. All have the same speed relative

Question:

Here we see top views of three motorboats crossing a river. All have the same speed relative to the water, and all experience the same river flow. Construct resultant vectors showing the speed and direction of the boats. Rank them from most to least for
a. The time for the boats to reach the opposite shore.
b. The fastest ride.