The maximum speed of a boat in still water is 27km/h. Now this boat is moving downstream in a river flowing at 9 km/h. A man in the boat throws a ball vertically upwards with speed of 10 m/s. Range of the ball as observed by an observer at rest on the river bank, is ______ cm . (Take ${\rm{g}} = 10\;{\rm{m}}/{{\rm{s}}^2}$)