A puppy met a leopard and ran away. The leopard chased him closely. Just as he was about to catch the puppy, the puppy fled to a place.

In order to get out of danger, the puppy must take advantage of the leopard's characteristic that it can only run along the pond to widen the gap between itself and the leopard. The puppy jumped into the pond and swam to the middle of the pond first.

Look at the position of the leopard at this time, and then swim in the opposite direction, so that the distance (that is, the radius) of the puppy will be long, while the leopard runs half a circle, which is π times (about 3. 14 times) of the radius. Although the speed of the leopard is 2.5 times that of the puppy, it is too late.

Extended data:

The origin of brain teasers:

Brainstorming originated in ancient India. Brainstorming is a series of complete comic jokes published by the culture of the times on 1989 12.06, which changed from the comic question on the previous page to the unexpected answer after flipping through it.

At that time, there was a social craze in Taiwan Province Province, and all the streets and alleys were asking each other brain teasers, which evolved into a pattern of cold jokes and was later introduced to Chinese mainland.

Brainstorming means that when thinking encounters special obstacles, you should quickly leave the habit of thinking and think about the problem from other aspects. Generally speaking, it refers to some intellectual questions that cannot be answered by the usual way of thinking.

This word game has an obvious feature, the title is very common, but the answer is very irritating or funny, and sometimes it plays an indirect role in swearing. Once cracked, it's amazing.