The motor boat sailed 1.4 hours along the river and 2.2 hours against the river. What is the path for the entire time of movement

The motor boat sailed 1.4 hours along the river and 2.2 hours against the river. What is the path for the entire time of movement, if the current speed is 1.7 km / h, and the boat’s own speed is 19.8 km / h.

The boat’s own speed, according to the condition, is 19.8 km / h, the current speed is 1.7 km / h, respectively, the speed of the boat along the river is:
19.8 + 1.7 = 21.5 (km / h) – boat speed along the river.
The motor boat sailed 1.4 along the river, covering the distance:
1.4 * 21.5 = 30.1 (km) – the boat sailed along the river.
19.8 – 1.7 = 18.1 (km / h) – boat speed against the river flow.
18.1 * 2.2 = 39.82 (km) – the boat sailed against the river.
39.82 + 30.1 = 69.92 (km).
Answer: 69.92 km.