The own speed of the ship is 24.5 km / h, the speed of the river is 1.3 km / h. First, the boat sailed 0.4 hours on the lake

The own speed of the ship is 24.5 km / h, the speed of the river is 1.3 km / h. First, the boat sailed 0.4 hours on the lake, and then 3.5 hours along the river against the current. What way did the boat go all the time?

1. Let’s calculate the length of the path covered by the lake:

24.5 · 0.4 = 9.8 km.

2. Let’s calculate the speed of the boat against the current:

24.5 – 1.3 = 23.2 km / h.

3. Distance traveled along the river upstream:

23.2 3.5 = 81.2 km.

4. The path covered by the boat:

9.8 + 81.2 = 91 km.

Answer: 91 kilometers.