The speed of the boat along the river is 17 km / h and against the current 11 km / h. What is the speed of the river?
April 9, 2021 | education
| Let’s solve the problem algebraically.
Let’s introduce the variable V km / h – the speed of the river flow.
Imagine the boat’s own speed from numerical data:
17 – V km / h, the case when the boat is moving down, that is, downstream.
11 + V km / h, the case when the boat is moving up, that is, against the current.
Let’s make the equation:
11 + V = 17 – V;
2V = 17-11;
V = 6: 2;
V = 3.
Let’s solve the problem arithmetically.
What is the doubled current speed: 17 – 11 = 6 km / h.
What is the speed of the current: 6: 2 = 3 km / h.
Answer: The river flows 3 kilometers per hour at such a speed.
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