At the same time, two motor boats departed towards each other from the two piers at the same speeds. After 1 hour they met.

At the same time, two motor boats departed towards each other from the two piers at the same speeds. After 1 hour they met. The boat that went with the current traveled 2.6 km more than the other boat. Calculate the speed of the river.

We denote the speed of boats by x (it is equal for them without taking into account the speed of the river flow)
We denote the flow velocity as y.
Distance is the product of time and speed. We know that both boats traveled for an hour. Let’s make up equality.
(x + y) 1 = (x-y) 1 + 2.6
x + y = x-y + 2.6
x + y-x + y = 2.6
2y = 2.6
y = 1.3
Answer: river speed 1.3 km / h