The boat and the raft are sailing on the river towards each other, the distance between them is 9 kilometers

The boat and the raft are sailing on the river towards each other, the distance between them is 9 kilometers through zero point five hours the boat and the raft meet. What is the speed of the river, the own speed of the boat.

To begin with, let’s determine our speed of convergence between the boat and the raft. To do this, we will divide our distance of 9 kilometers by the time after which two river vessels will meet.
9 / 0.5 = 18 – kilometers per hour speed of approach of river vessels.
It is known that the speed of the boat is 15 kilometers per hour.
18 – 15 = 3 – kilometers per hour the speed of the river.
The boat overcomes the path against the current, which means that the current takes part of the speed from it.
15 + 3 = 18 – kilometers per hour the boat’s own speed.
Answer: 3 and 18 kilometers per hour the speed of the river and the own speed of our boat, respectively.