# The boat was moving along the river at a speed of 18.4 km / h, against the current at a speed of 16.4 km / h

The boat was moving along the river at a speed of 18.4 km / h, against the current at a speed of 16.4 km / h, how long will the boat sail on the lake in 4 hours?

Before determining how far the boat will travel across the lake in 4 hours, you need to find its own speed.

Since we know the speed of the boat downstream and against it, we divide the sum of the known speeds by 2 directions.

(18.4 + 16.4) / 2 = 34.8 / 2 = 17.4 km / h.

We find the distance.

To do this, we multiply the boat’s own speed by the period of movement.

17.4 * 4 = 69.6 km.

Answer: In 4 hours the boat will cover 69.6 km along the lake.

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