The boat sailed for 2 hours at a speed of 27 km / h. On the way back, he spent 1 hour more. How fast was he walking back?

1) Since the boat sailed for 2 hours at a speed of 27 km / h, in order to find out how far the boat sailed, you need to multiply the speed of the boat by the time it was on the way: 27 km / h * 2 = 54 km. 2) Since the boat spent one hour more on the way back, it sailed 54 km in 3 hours. In order to find out what the speed of the boat was on the way back, you need to divide the distance that he sailed by time: 54 km / 3 h = 18 km / h. Answer: the boat went back at a speed of 18 km / h.