The boat first went against the river for 2 hours, and then turned back and went along the current for another 1.5 hours.

The boat first went against the river for 2 hours, and then turned back and went along the current for another 1.5 hours. What path did the boat cover in these 3.5 hours, if the speed of the river flow is 1.8 km / h, and the speed of the boat in still water is 21.4 km / h?

Let’s calculate how many kilometers it is possible to represent the distance that has been traveled downstream:

(21.4 + 1.8) * 1.5 = 34.8.

Let’s calculate how many kilometers it is possible to represent the distance that was passed against it:

(21.4 – 1.8) * 2 = 39.2.

Let’s calculate its total path:

34.8 + 39.2 = 74.

Answer: 74 km.