The speed of the boat against the current is 12.8 km / h. The speed of the current is 0.9 km.

The speed of the boat against the current is 12.8 km / h. The speed of the current is 0.9 km. How far does the boat sail downstream in 2.5 hours?

Find the boat’s own speed.

To do this, add the speed of the current to the speed of the boat against the current of the river.

We get:

12.8 + 0.9 = 13.7 km / h.

Let’s determine the speed of the boat along the river.

To do this, we also add the current speed to the boat’s own speed.

13.7 + 0.9 = 14.6 km / h.

We find the distance that the boat will sail in 2.5 hours.

To do this, we multiply the obtained speed value by time.

Will be:

14.6 * 2.5 = 36.5 km.

Answer: The boat will cover 36.5 km in 2.5 hours.