A man rows at a speed of 6 km/h in still water. If the river current flows at 1.2 km/h, and it takes him exactly 1 hour to row to a certain point and return, what is the distance to that point?

Explanation

The man's rowing speed in still water is 6 km/h, and the river flows at 1.2 km/h. When rowing downstream, his effective speed is 6 + 1.2 = 7.2 km/h, and upstream it is 6 - 1.2 = 4.8 km/h. Let the distance to the place be x km. The total time for the round trip is given by x/7.2 + x/4.8 = 1 hour. Solving for x, we get x = 2.88 km.