The speed of the boat downstream of the river is 15.3 km / h, the speed of the boat upstream of the river

| June 16, 2021 | education

The speed of the boat downstream of the river is 15.3 km / h, the speed of the boat upstream of the river is 6.3 km / h. Find your own boat speed with the speed of the river.

1. Let the speed of the river flow be x kilometers per hour.

2. Then the boat’s own speed is equal to (15.3 – x) kilometers per hour.

3. The speed of the boat against the current of the river will be equal to ((15.3 – x) – x) kilometers per hour.

4. Let’s make an equation and find the speed of the river, if it is known that the speed of the boat against the current is 6.3 kilometers per hour.

15.3 – x – x = 6.3;

15.3 – 6.3 = x + x;

2x = 9;

x = 9/2;

x = 4.5 kilometers per hour.

5. Find the speed of the boat.

15.3 – 4.5 = 10.8 kilometers per hour.

Answer: The speed of the boat is 10.8 km per hour, the speed of the river is 4.5 km per hour.



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