The boat’s own speed is 15.4 km / h, and its speed upstream of the river is 12.1 km / h. How fast does the river flow?

| June 17, 2021 | education

The boat’s own speed is 15.4 km / h, and its speed upstream of the river is 12.1 km / h. How fast does the river flow? What is the speed of the boat along the river? How far will the boat sail if it moves 1.4 hours along the river?

1. Let’s calculate the speed of the river. For this, it is necessary to subtract the speed of the river from the boat’s own speed.

15.4 – 12.1 = 3.3 km per hour.

2. Let’s calculate the speed of the boat along the river, adding the speed of the current to the boat’s own speed.

15.4 + 3.3 = 18.7 km per hour.

3. Let’s calculate the distance that the boat will sail in 1.4 hours, moving along the river.

18.7 * 1.4 = 26.18 km.

Answer: The speed of the river is 3.3 km per hour. The speed of the boat along the river is 18.7 km per hour. The distance that the boat will sail in 1.4 hours downstream is 26.18 km.



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