 
 <translate> Speed of the boat in still water = (60+80)/2 = 70 kmph. Speed of the stream = (80-60)/2 = 10 kmph Final answer: (A). <ibo> Ọsọ ụgbọ mmiri ahụ na mmiri na-adịghị agba = (60+80) / 2 = 70 kmph. Ọsọ nke iyi = (80-60) / 2 = 10 kmph Azịza ikpeazụ: (A). 