The speed of the boat along the river is 28.7 km / h, and against the current -23.4 km / h. Find the speed of the river.
| April 8, 2021 | education
1. Take for x (km / h) the speed of the boat in still water, for y (km / h) the speed of the river:
2. Let’s compose two equations:
(1) x + y = 28.7;
(2) x – y = 23.4;
3. Add these equations:
2x = 52.1;
x = 26.05 km / h.
y = 28.7 – 26.05 = 2.65 km / h.
Answer: the speed of the river is 2.65 km / h.
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