The boat passed along the river in 2 hours 29 km, and against the stream in 5 hours 47.5 km.

The boat passed along the river in 2 hours 29 km, and against the stream in 5 hours 47.5 km. What is the speed of the boat in still water and what is the speed of the river flow?

Let’s determine the speed with which this boat was moving along the flow of the water stream, knowing that it covered 29 kilometers in 2 hours:

29: 2 = 14.5.

Let’s determine the speed with which this boat was moving against the current of the water stream:

47.5: 5 = 9.5.

Determine the flow rate of the water flow:

(14.5 – 9.5) / 2 = 2.5.

Let’s determine the speed of the boat in still water:

14.5 – 2.5 = 9.5 + 2.5 = 12.

Answer: The speed of the water stream is 2.5 km / h, the speed of the boat in still water is 12 km / h.