In Taizhou in the 1980s, how many hours did it take for a 12 horsepower, 20-ton cement ship to reach the sea from Jiaojiang Wharf?

12 horsepower is about 8 kW, power is 8000 W, and the speed of a 20-ton ship is about 0.4m/s = 24m/min =1440m/h.

The distance from Jiaojiang Wharf to Linhai is more than 40 kilometers, which takes almost more than 30 hours. In other words, it will take more than one day. The above results are calculated by myself. In the 1980s, it might take so long to pull 20 tons of goods from Jiaojiang to linhai. Judging from the horsepower, it's about this time. The horsepower of an average car is more than 70 horses, which is more than seven times that of the cargo ship in question. You can imagine how slow the ship in question is, so it takes more than 30 hours. It's hard to say exactly how much, because the external factors such as route, weather, wind speed and water flow are uncertain, so it can only be calculated like this, about 30~32 hours, I hope the landlord will adopt it! It is not easy to type so many words ~ _ ~