Dressed as an abandoned daughter of a wealthy family, she relies on metaphysics to become a god

In order to find the specific location of the recording, the police station specially prepared an oversized map that could not fit on the conference table. It also contained the records they had made previously.

Using the smelting plant as the center of the circle, the police calculated the possible location range of the sound, which was in the shape of a ring.

The southwest side of the ring is close to the city. There are many entertainment venues and it is very lively at night. However, there is no music in the recording, so this place was excluded first.

Among the remaining areas, they found that some areas would be interfered by signals from cables, and the recording would be noisy or intermittent.

Finally, only five small pieces of the ring are left.

Chu Yao borrowed an erasable marker, marked the ring where the ranch was located, and found the location of the hotel on the map.

She connected the two places with a straight line, which happened to pass through the point where the factory was located, but the midpoint of the line segment was not the same point as the factory.

Chu Yao explained: "According to the calculated data, the sound range should have been within the ring outside the hotel. However, the hotel is located in a high terrain, the temperature is lower than in other areas, and the humidity is high, which leads to the propagation of sound. The speed has slowed down."

"However, even if the transmission speed will slow down, it will only be a very weak change. After all, the propagation speed of sound is quite fast." Team Liu questioned.

"That's true, but it's not just one factor." Chu Yao continued, "There's another important reason. Sound propagates faster in solids. There are many large buildings around the ranch, but the area around the hostel is more open. The same propagation distance will result in different sound levels in the two places."

Captain Liu rubbed his chin and continued what Chu Yao said, "I think it has something to do with the mountains on both sides of the hotel."

There are very long and narrow mountains on both sides of the hotel. Although they are not high mountains, they still create echoes.

These factors lead to the fact that a hotel that is very close to the circle but not within the circle may actually be the location of the recording.

However, after all, the police are not physicists who specialize in studying the speed of sound propagation, so it is understandable that they did not consider these reasons before.

After listening to this, Captain Liu thought seriously for a while and then said again: "I understand, if the kidnapper asks an arithmetic question, it does not mean that there is only one answer to the question, there may be two, three, or Even more 'solutions'."

Then, he thought of something else.

"There are things he left behind in the ranch, and there might be something in Room 503." Captain Liu's eyes flashed, "Yes, we have to go there and get the things back!"

Facing a highly intelligent criminal, Captain Liu's first reaction was not worry, but excitement.

He was quick and resolute in his work, and soon organized a group of people to go with him to the hotel at the bus terminal.

Chu Yao and Chen Peiwen were waiting for their return at the police station.

"Sister Chen, I don't know if you have eaten anything, but I bought you two meals." Officer Zheng handed over two steaming boxes.

Chen Peiwen was warmed by his actions. She hadn't had a hot meal for a long time, and most of the time she just dealt with it casually.

"Thank you." She said sincerely, "When this case is over, I will definitely send you a banner."