The boat’s own speed is 3.4 km / h. The speed of the boat against the river flow is 0.8 km / h.

The boat’s own speed is 3.4 km / h. The speed of the boat against the river flow is 0.8 km / h. Find the speed of the boat with the current.

1) The speed of the boat when moving against the stream of the river is defined as the difference between the boat’s own speed and the speed of the current.

Let x km / h be the speed of the river.

Then we can write the expression:

3.4 – x = 0.8.

From here

x = 3.4 – 0.8;

x = 2.6.

We get that the speed of the river is 2.6 km / h.

2) The speed of the boat along the river is equal to the sum of the boat’s own speed and the speed of the current:

3.4 + 2.6 = 6 km / h.

Answer: the speed of the boat along the river is 6 km / h.