Shuttle transport
A river 777 km long flows through forests and meadows, and here and there a port flickers on its bank. Between 2 of 5 ports on the river, there is a permanent shuttle transport. It is provided by the 77-year-old ship Quendolína with captain Bluebeard, who is 100 years old and still has 15 teeth. Quendolína sails from one port to the other for 4 days, then it is unloaded in 1 day by 7 workers, and the captain can set out on the return voyage. That one, because it is with the current and Quendolína is unloaded, lasts only three days. After arrival in the first port, 5 workers load Quendolína again, the crew and the ship rest, and after two days they again set out on the voyage. The last entry in the ship's log about the departure with a full deck is from 1 March. Where will Quendolína be found on 9 April of the same year, if it is painted red?
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