Required Mathematical Intelligence

Chapter 49

A and B often compete in the karate arena to wipe the floor with rags.Because A moves faster, the ratio of their speeds at the same time is 5:4. But once it was 5:6. What's the reason?And the speed of the two has not changed.

[Answer: It turns out that B used a wider rag.From the conditions of the question, we can understand the intention of the questioner, which is to illustrate the importance of prompt decision. ]
(End of this chapter)