Calculate the speed of a boat in still water if it travels 176 km downstream in 11 hours and returns 144 km upstream in 18 hours.
Downstream speed of the boat = 176/11 = 16 km/hr Upstream speed of the boat = 144/18 = 8 km/hr Speed of boat in still water = (16 + 8)/2 = 12 km/hr
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