A motor boat going upstream in a river travels the distance between two cities in six hours. The same distance is travelled downstream in a river in 5 hours. If the Year Timing (in seconds) 1972 51.08 49.28 48.88 48.83 48.65 48.83 48.25 49.11 49.41 1976 1980 1984 1988 1992 1996 2000 2004 speed of the river is 2 km/h. Find the speed of boat in still water.