Originally Posted by a d e p t
Suppose there is a river that has no current. Buck Shot got into his canoe and paddled upstream from his dock to the river's bend five kilometers away. At that point he turned around and paddled back to his dock. He checked his watch and saw that the trip took 40 minutes.
Now, suppose the river has a current of two kilometers per hour, and Buck makes exactly the same trip.
With the river flowing at two kilometers per hour, will the trip be longer than 40 minutes, shorter than 40 minutes, or will it take the same amount of time?