Wu Tongguang tore off a piece of paper from the notebook that Ah Pian had just given him, and listed the equation on the top of the paper.

Wu Tongguang recorded the time at 10:22 before going to Xiao Guodong's office, and counting the time he spent thinking, it is estimated that the time when the truck carrying He Hongwei drove out of Nanjing Station should be at 10:20, and the time when Xiao Guodong received He Hongwei's call was 10:50, and the difference between before and after was half an hour.

Wu Tongguang wrote down the speed of the truck on a piece of paper, if a military truck like this is driving at full speed, the speed should reach 30 kilometers per hour, but considering that it is driving in an urban area, due to the influence of passing pedestrians and vehicles, the speed of a military truck should be almost 20 kilometers per hour.

Multiply the difference between the time difference of half an hour and 20 kilometers per hour to get the distance traveled by the truck is almost 10 kilometers.

Speaking of which, many people may have already seen it. Wu Tongguang wanted to use the time difference to get the distance traveled by the military truck, and then calculate the approximate location of the destination of He Hongwei and his party.

The reason why he was able to think of this method was because Wu Tongguang was sure that this secret mission was directly commanded by Xiao Guodong, and He Hongwei would definitely report to Xiao Guodong as soon as he arrived at the destination.

Subsequently, Wu Tongguang went to Xiao Guodong's office on the pretext of pruning potted plants, and stayed at his door to trim potted plants, and deliberately did not close the door of Xiao Guodong's office. Wu Tongguang did all this, in fact, he was eavesdropping on the phone call between Xiao Guodong and He Hongwei.

There are two important factors that limit the success of this approach. One of them is that this mission actually requires the army to send military trucks to pick up and drop off the operational team members on the mission, so for the sake of insurance, the military trucks are likely to make a detour during the drive.

If the truck really detoured around Nanjing City, then the distance of the truck must be very different from the distance between Nanjing Station and the destination of He Hongwei and his party.

Another constraint, and the most important of them, is whether He Hongwei and his party are really going to perform the security mission of the rattlesnake.

Although Wu Tongguang is ninety percent sure that the mission that He Hongwei and his party are going to perform must be related to the rattlesnake, this is Wu Tongguang's subjective speculation after all, and there is no full evidence to confirm it.

But at this time, Wu Tongguang can no longer take care of so much, if the positive and negative sides of the two factors have to be confirmed, then his reconnaissance mission can only stay in place, and it is impossible to continue to push downward, so it can only be considered according to positive factors. One is that the truck did not make a detour, and the other is that this mission is aimed at rattlesnakes.

Then, Wu Tongguang drew on a map prepared in advance with a pencil, remembering that when the truck drove out of the Nanjing Station compound, it turned right.

Wu Tongguang marked the distance of ten kilometers to the right from Nanjing Station, and he drew all possible routes. In the end, Wu Tongguang checked and found that there were as many as eighteen.

Fortunately, according to the criteria and requirements for the selection of safe houses by the military united front, most of the routes here can be excluded. In the end, Wu Tongguang locked on a small area, which was most likely the destination of He Hongwei and his party.

Wu Tongguang knows this area, although the area is not large, but there are two or three hundred households, it is impossible to investigate one by one, first of all, it is not allowed in time.

At this moment, there was a knock at the door. Then came the voice of Ah Ba: "Angkor, what are you doing by locking yourself in your room and not going to eat in the middle of the day?" ”

Wu Tongguang knew that it was Ah Cake and the others who came back from eating, so he hurriedly put away the map and pen and paper on the table, Wu Tongguang said while cleaning up, "Wait a minute!" Here it is! ”

At first, the knocking sound was very small, but later, it may have been that Wu Tongguang did not come to open the door for a long time, Ah Cake and they were a little anxious to wait, and the knock directly turned into a smashing door, and the sound of "Boom Boom" sounded, and then Ah Cake's voice "Hurry up, Angkor!" The braised pork that I beat for you will be cold in a while! ”

At this time, Wu Tongguang had just finished cleaning up, and he looked around beside his desk again, and saw that there were no clues left, so he replied, "Here, here." Don't worry! When the meat is cold, I'll eat it as jelly! As soon as the words fell, Wu Tongguang had already walked to the door and pulled down the bolt.

In the afternoon of the same day, Wu Tongguang casually found an excuse and left Nanjing Station. I took a rickshaw and came to the area circled on the map at noon.

After Wu Tongguang arrived at his destination, he stood in an alley and looked at both sides, and saw dozens of houses on both sides of the alley. I couldn't help sighing, let's start investigating from this alley first!

Traditionally, and the most commonly used method of investigation, is to conduct door-to-door investigations under various other names. This method is time-consuming, labor-intensive, and difficult to achieve results in a short period of time.

Even if you are lucky, you didn't check a few households and saw the familiar face of Nanjing Station, then at this juncture, Wu Tongguang appeared at the location of the secret mission, undoubtedly throwing himself into the net, telling his colleagues at Nanjing Station that I, Wu Tongguang, was sent by the Nanjing underground party to confirm the hiding place of the rattlesnake.

Wu Tongguang knows the stakes very well, and as for how to investigate, he naturally has his own set of methods, which Wu Tongguang has already thought about when he calculated this area at noon.

Wu Tongguang walked along this alley to the end, at the end of which was a small intersection, and next to the intersection was an old man who was setting up a stall selling roasted sweet potatoes. The old man is selling his roasted sweet potatoes, "Hot roasted sweet potatoes, sweet and noodles!" ”

Wu Tongguang stepped forward and first bought a large roasted sweet potato. Wu Tongguang took the roasted sweet potato in his hand, because it was just baked, the roasted sweet potato was still very hot, and Wu Tongguang had to pour the roasted sweet potato back and forth with two hands.

Wu Tongguang saw that the old man put a raw sweet potato into the furnace bucket skillfully. Only then did he open his mouth and ask, "Gentleman, did you see a military truck around here this morning?" ”

The old man's eyes rolled, and then he said, "I'm getting older, and this memory is getting worse every day, let me think about it first!" ”

Wu Tongguang could tell that the old man was trying to recall the questions raised by the customers who took care of his business.

After a while, the old man replied to Wu Tongguang with a little regret, "I haven't seen it!" ”

Hearing the old man's negative answer, Wu Tongguang's expression was also a little regretful, but he still replied with a smile, "Yes!" You're busy first! With that, he strode to the next intersection.

The old man didn't forget to take this opportunity to attract repeat customers, and politely shouted, "Eat well, come again!" ”

The reason why Wu Tongguang asked these street vendors was because these vendors set up stalls on the street all year round, and if a military truck drove by on the street, it would definitely not escape their eyes.

If it can be determined that this military truck has really appeared in this area, then Wu Tongguang can be sure that his judgment is correct. Second, although the truck driver is not stupid enough to park the car at the door of the safe house, the truck must not be too far away from the location of the safe house, so that the scope can be further narrowed.

According to this line of thought, Wu Tongguang continued to ask the sellers of fried melon seeds and popcorn, but they still found nothing.