Answer: It can travel about 460 miles in 39 hours with the same constant speed.
Step-by-step explanation:
Firstly you divide 248/21 to determine the constant speed that the boat is traveling once you do that you get 11.8. And then finally to find how far it will tavel in 39 hours, you mutiply 11.8 by 39 and you get 460.2.
