The boat sailed 2 hours at a speed of 27 km on the way back, he spent 1 hour more. how fast did he walk back?

1. Find out how much time the boat spent on the way back. To do this, add 1 hour to the time he spent on the road:
2 + 1 = 3 hours
2. Find out how fast the boat was going back. For this, the distance that he walked back, we divide by the time spent:
27 km / 3 h = 9 km / h.
Answer: the boat was going back at a speed of 9 km / h.