Final answer:
The distance a sailfish swims is proportional to the number of hours it swims, as speed equals distance divided by time and a consistent speed implies a linear relationship between distance and time.
Step-by-step explanation:
The world's fastest fish, a sailfish, swims at a speed of 69 miles per hour, and the distance it swims is proportional to the number of hours it swims. This relationship is because speed equals distance divided by time, which can be expressed as distance = speed x time. Therefore, if a sailfish swims consistently at its top speed, the distance it travels will increase linearly with the time it swims, thus defining a proportional relationship.