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The solution of a mathematical equation in grade one.
1 solution: let the speed of the ship be x km/h and be still in the water.

4X+2=5X-2

4X+8=5X- 10

X= 18

18+2 = 20km/h

The speed of ships sailing along this river is 20 kilometers per hour.

2 solution: let the speed of water descending be x km/h, then the speed of water descending is x-2-2 km/h.

4X=5X-2-2

4X=5X- 10- 10

X=20

The speed of ships sailing along this river is 20 kilometers per hour.

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