You are presented with the quiz "A telephone is used for communication by humans between what span?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "atelephone is used for communication by humans over long distances" and "open water races of 5 to 25 kilometers are offered to long distance swimmers". 

So, what's the best answer to the question?


 

 25 kilometers or more          