The distance between the piers is 480 km. The boat passed it in 6 hours. On the way back, his speed increased by 16 km / h

The distance between the piers is 480 km. The boat passed it in 6 hours. On the way back, his speed increased by 16 km / h. How long does it take for the boat to go all the way back and forth?

Let’s find the speed with which the boat was moving if we know that it covered 480 km in 6 hours:
v = 480: 6 = 80 km / m.
Since on the way back its speed increased by 16 km / h, we calculate this speed:
80 + 16 = 96 km / h.
Then the boat will cover this distance in:
t = 480: 96 = 5 hours.
Thus, on the way back and forth, the boat will cost:
6 + 5 = 11 hours.
Answer: the boat will spend 11 hours on the road.