"From the mouth of the Yangtze River, it is 1,400 miles... You must know that the sea is not as good as the land, it depends on whether the wind is favorable. But in any case, the average speed of 50 miles per hour is not wrong (Ming and Qing dynasties The boat averages about 13 kilometers per hour, or 26 kilometers per hour), and can travel 600 miles in a day and night, and 1,400 miles is just less than three days."

Jiang Xinghuo's slow voice continued to come through the wall: "Besides, isn't there Jeju Island as a transit point? Given Li's North Korea's fear of Daming, just send envoys to ask for or buy from Li's North Korea."

Zhu Di was so anxious that he almost stomped his feet when he didn't hear the key information.