Speed of boat in downstream is 12 km/hr and in upstream is 06 km/hr. Find the speed of boat in still water:

05 km/hr 06 km/hr 09 km/hr 10 km/hr

09 km/hr

Speed of Boat in still water = \(\frac{Speed\;of\;boat\;in\;Down\;stream\;+\;Speed\;of\;boat\;in\;Up\;stream}{2}\)                                            = \(\frac{12 + 6}{2}\)                                            = 9 km/hr