Eight people arrived at the railway station by two cars respectively. One of the cars broke down at a distance of 0/5 km from the railway station/kloc-.

The best scheme is that a car carrying four people leaves for a period of time, followed by four people. The car stops at a certain position, so that the four people in the car get off and move on. The car turns around to pick up the four people behind and drive to the station, so that eight people can arrive at the station at the same time.

Let the distance between the position where the car turns around and the position where the four people behind it are connected be a.

The formula is (15+2a)/60 = (15-a)/2/5+(15+a)/2/60.

If a= 1 1, the required time is (15+2a)/60=37/60 (hours) =37 (minutes).