The boat moves along the river against the current at a speed of 12 km / h, and downstream

univerkov | March 5, 2021 | education

The boat moves along the river against the current at a speed of 12 km / h, and downstream at a speed of 16 km / h. What is the speed of the current?

Task data: V1 (speed of a given boat against the current) = 12 km / h; V2 (speed of a given boat downstream) = 16 km / h.

We express the river flow speed from the following equality: V2 – Vt = V1 + Vt = Vk (boat speed), whence V2 – V1 = Vt + Vt and Vt = (V2 – V1) / 2.

Let’s calculate: VT = (16 – 12) / 2 = 2 km / h.

Answer: The speed of the river is 2 km / h.

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