The boat went along the river at a speed of 30 km / h, and against the current at a speed of 25.8 km / h.
| July 28, 2021 | education
The boat went along the river at a speed of 30 km / h, and against the current at a speed of 25.8 km / h. What is the speed of the current?
1. Find out the difference in speed. To do this, we subtract the speed of the boat against the river from the speed of the boat along the river:
30 km / h – 25.8 km / h = 4.2 km / h.
2. Find out what is the speed of the river. To do this, we divide the difference in the speeds of movement with the flow and against the flow in half:
4.2 km / h / 2 = 2.1 km / h.
Answer: the speed of the river is 2.1 km / h.
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