Final answer:
The humpback whale would have traveled further on Day 30 than the gray whale.
Step-by-step explanation:
The humpback whale would have traveled further on Day 30.
The question states that the humpback whale continues to travel at the same rate. Therefore, it would cover the same distance each day.
Since the humpback whale is already traveling at a faster rate than the gray whale, it would have traveled a greater distance by Day 30.