What speed will you get if you add up the speed against the current and the speed of the usual course of the river?

If an object floating on a river has its own speed, then when moving against the current, its speed decreases by the value of the speed of the river’s current, therefore, adding the speed of the current to the speed of the object against the current, its own speed will be obtained. Let us demonstrate this by calculation. Let’s take the object’s own speed equal to X km / h, and the speed of the river A km / h. Then the speed of the object against the current will be:

X – A km / h.

And the asked amount will be:

X – A + A = X km / h;

That is, we got our own speed.