2. There are two docks A and B in the middle of a river, and the waterway of A and B is 91km. A boat goes downstream from A to B at 8am and arrives at 3pm. It is known that the time for the second boat to return from B to A is 6 hours longer than when it came, so what is the speed of the boat per hour? How many kilometers is the water speed per hour?
3. The speed of a ship in still water is 18km/h, and it has traveled 16km after sailing along the water for 8 hours. What is the speed of the ship against the water per hour? How many hours does it take to return to the original place?
4. A ship sails along the river for 5 hours * * * and travels 12 kilometers, and it takes 8 hours to return to its original place. So what is the speed of the ship in still water and the speed of water flow per hour?
5. For the first time, a boat sailed 48km downstream and 8km upstream, which took 1 hours. For the second time, it sailed 24km downstream and 14km upstream. Find the speed and current speed of this boat in still water?
6. A ship sailed from A to B along the river, traveling at a speed of 28 kilometers per hour. After arriving at B, it sailed against the water and returned to A, with a speed of 4 kilometers per hour. How many kilometers are there between Party A and Party B?
7. The speed of a ship in still water is 18 kilometers per hour, and the current speed is 2 kilometers per hour. It takes 15 hours for the ship to sail from A to B.
(1) How many kilometers is the distance between A and B?
(2) How many hours does it take for the ship to return from B to A?
8. Pier A and Pier B are 56 kilometers apart. A ship sailed from Pier A for 2 hours to Pier B. It is known that the ship travels 24 kilometers per hour in still water. How many hours will it take for the ship to return to Pier A?
9. In still water, the speed of ship A is 22km per hour, and the speed of ship B is 18km per hour. First, ship B sails with the current from a port, and two hours later, ship A sails in the same direction. If the current speed is 4km per hour, how many hours can ship A catch up with ship B?
1. It takes 4 hours for a ship to sail along the current, 5 hours for sailing against the current, and the water speed is 2 kilometers. Find the speed of the ship in still water.
11. The distance between Port A and Port B is 36 kilometers, and it takes 35 hours for a ship to travel back and forth between the two ports. It takes 5 hours more to sail against the current than against the current, and another sailboat travels 12 kilometers per hour. This sailboat travels back and forth.
12. The speed of a sailboat in still water is 12 kilometers per hour. It takes 4 hours for a sailboat to go from an upstream port to a downstream port and back again in a river with a water flow speed of 3 kilometers per hour. How many kilometers are the two ports apart?