Datang: The prince of salted fish was overheard by Li Er

While Li You said, Wang Xiaotong kept the conditions in mind.

Compared with the jerky words in the Sutra, Li You's questions are much simpler and easier to understand.

Not only Wang Xiaotong, but also the mathematics students beside him, and even Kong Yingda and others who followed Li You to collect the papers began to silently calculate in their hearts.

However, this question seems simple, but because it is in a river, with the interference of water flow speed, it makes people feel less obvious.

Moreover, while the boatman is going down the water, the hat is also constantly moving due to the current, so after calculating the time required once, it is necessary to calculate the distance the hat moves during this time.

Then by analogy, the calculated distance is getting shorter and shorter, but it seems endless.

Kong Yingda thought for a while, then felt his head buzzing, shook his head and looked at Wang Xiaotong beside him.

At this moment Wang Xiaotong has closed his eyes, his hands are constantly pinching the hand formula, as if he is trying to calculate something.

Kong Yingda knew that this was what Wang Xiaotong looked like when he was calculating the problem, so he didn't bother, and then looked at Li You.

At this moment, Li You was staring at Wang Xiaotong with a funny look on his face, arm in arm, without a look of anxiety at all.

He understands that if this problem is treated as a simple chase, it is the famous Zeno's paradox.

In the face of infinitely divided time and space, the rabbit can never catch up with the tortoise that ran a distance ahead of it.

Because when the rabbit moved the distance between the two, the tortoise crawled forward again.

Of course, this paradox has long been deciphered by modern mathematics, because there is a misleading hidden in the paradox, that is, after the end of each paragraph, the rabbit has to wait for the tortoise to finish running before letting the rabbit continue to run.

The infinitely subdivided time and space give people the illusion that the rabbit cannot catch up with the tortoise.

In fact, if it is placed in continuous time and space, it is easy to get the time when the rabbit catches up with the tortoise.

But Li You's current question is actually not so profound, and it can be answered quickly from another angle.

But it is obvious that Wang Xiaotong has been led astray by Li You at this moment.

As time goes by, there are more and more people around.

Many people who took the exam in other places heard that Li You and Wang Xiaotong were competing in the exam, and they also slowly gathered over.

In the crowd, there were also two inconspicuous figures, one old and one young.

The boy was walking with a slight limp, and the man was supporting him lovingly.

These two people are Li Shimin and Li Chengqian.

Li Shimin knew that Li You was taking an open-book exam at the Imperial College today, so he took Li Chengqian to watch the fun after he came down to court.

Since Li Chengqian's performance in the hall last time, Li Shimin has had a refreshing feeling in the past two days.

Li Shimin was delighted with Li Chengqian's change, so today Li Shimin took him to watch the excitement.

As there were more and more people around, Wang Xiaotong's complexion became more and more difficult to look at, the movements of his hands slowly slowed down, and his expression was extremely solemn.

"Hey!"

Finally Wang Xiaotong sighed heavily, as if he had aged ten years in an instant.

Obviously, Wang Xiaotong went astray under Li You's misleading, and went further and further away.

"The King of Chu is brilliant at this question, really brilliant!"

"Old man..."

Just when Wang Xiaotong was about to say that he was willing to surrender, a voice suddenly came.

"King Chu's question is really clever, but how can you hide it from my teacher with your little tricks?"

Everyone turned their eyes and found that it was Li Anren who spoke.

Li You smiled at the corner of his mouth, and asked a little excitedly: "An Ren has an answer? Let's hear it."

Li Anren was also immersed in the joy of solving the problem at this moment, and immediately said: "Of course there is an answer, and the answer is the three quarters of a century."

"It took the boatman an hour to pick up the hat."

"I just didn't expect that the dignified prince of the King of Chu would ask such insidious questions."

Li You suddenly had three black lines on his face.

[Isn't it normal to have misleading information on this topic, you just need to figure it out, how can you blame me! 】

Just when Li You felt a little wronged, Li Anren didn't care at all and continued talking.

"Actually, answering this question is not difficult at all. I was stuck on the water flow when I was solving the problem just now, but later I found out that the speed of the water flow is a trap carefully set up by the King of Chu."

"At the beginning, I also fell into this trap. It wasn't until I remembered that when I went to Jiangnan with my grandfather a few years ago, I took a big boat and realized it."

"As for the question just now, if the fisherman and the hat are both on the same big boat, it won't change the conditions of the original question."

"In this way, the question becomes how long it takes for the fisherman to drop the straw hat at the bow, and then go back to pick it up after walking to the stern."

Having said that, Li Anren paused, giving everyone a little time to think.

After seeing the light of enlightenment in Wang Xiaotong's eyes, he continued to speak.

"In this way, the problem is very difficult. They are all on the boat. Although they will move with the water, they don't have to think about it at all."

"In this way, the boatman left the hat for five miles at a speed of ten miles, and then went back for five miles, exactly one hour."

After Wang Xiaotong finished speaking, he raised his head, looking very proud.

"Clap clap clap!"

At this moment, everyone has not fully understood Li Anren's calculation process and is still thinking about it, but Li You, who made the question, has already taken the lead in applauding.

Li Anren was a little embarrassed by Li You's applause.

He hurriedly said: "The teacher can also crack this trivial skill, but the teacher just thinks it's disdainful."

Hearing this, for the first time, Wang Xiaotong felt a little ashamed in his heart.

He really lost this question. If Li Anren hadn't appeared, he was ready to admit defeat just now.

However, this question also aroused his competitive spirit and interest in Li You.

He also wanted to see how talented the young man in front of him was in arithmetic.

Li You didn't care about Li Anren's ridicule, he still had a lot of things he wanted to do through this competition.

Although the question just now was answered, it was just the beginning.

Li You said to Wang Xiao, "Since An Ren has already answered my first question, please ask Dr. Wang to ask the second question."

Wang Xiaotong nodded and said: "Today there are things that I don't know the number of. If you count three or three, you have two, if you count five or five, you have three, and if you count seven or seven, you have two. How many things are there?"

Hearing this question, Li You suddenly laughed.

"Dr. Wang, don't let me go like this!"

Li You's smile made everyone present feel a little confused.

Didn't the two of them compete with each other just now? Why did they start to give in to each other after the second question?

When Li You said this, Wang Xiaotong was taken aback for a moment, and immediately understood.