The speed of the boat along the river is 28, 7 km / h, and forgiving the current – 23, 4 km / h

The speed of the boat along the river is 28, 7 km / h, and forgiving the current – 23, 4 km / h. Find the speed of the current.

1. We take for x (km / h) the speed of a river vessel in still water (own speed), for y (km / h) the speed of the water flow.

2. Let’s compose two equations:

x + y = 28.7;

x – y = 23.4;

3. Add these equations:

2x = 52.1;

x = 26.05 km / h – the speed of a river vessel in still water (own speed).

26.05 + y = 28.7;

y = 28.7 – 26.05 = 2.65 km / h – the speed of the water flow.

Answer: the speed of the water flow is 2.65 km / h.