Speed of the boat downstream 15.4 km / hour Speed of current 4.7 find the boat’s own speed and its speed upstream

We know the speed with which the boat was going along the river and the speed of the river.

So, to find the boat’s own speed, you need to subtract the speed with which the river flows from the speed of its movement downstream:

15.4 km / h – 4.7 km / h = 10.7 km / h.

Now, knowing the speed with which the boat was moving, we find the speed of its movement against the current.

To do this, remove the speed of the river from its movement speed:

10.7 km / h – 4.7 km / h = 6 km / h.

Answer: The boat’s own speed is 10.7 km / h, the speed with which the boat was going against the current is 6 km / h.