The boat sailed downstream for 3.6 hours along the river at a speed of 10.8 km / h and 2.5

The boat sailed downstream for 3.6 hours along the river at a speed of 10.8 km / h and 2.5 hours against the current at a speed of 7.8 km / h. How far has the boat covered?

Find the distance traveled by the boat along the river:
10.8 * 3.6 = 38.88 (km).
Let’s find the distance that the boat has traveled against the stream of the river:
7.8 * 2.5 = 19.5 (km).
Let’s find the total distance covered by the boat:
38.88 + 19.5 = 58.38 (km),
Answer: in total, the boat sailed 58.38 kilometers.