The maximum speed of a boat in still water is 27 \, textkm/h$27 \, \text{km/h}$ . Now this boat is moving downstream in a river flowing at 9 \, textkm/h$9 \, \text{km/h}$ . A man in the boat throws a ball vertically upwards with speed of 10 \, textm/s$10 \, \text{m/s}$ . Range of the ball as observed by an observer at rest on the river bank, is ________ cm. (Take g = 10 \, textm/s^2$g = 10 \, \text{m/s}^2$ ) [cite: 1, 2]