 
 <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). <hau> Gudun jirgin ruwa a cikin ruwa mai zaman kanta = (60 + 80) / 2 = 70 kmph. Saurin rafin = (80-60) / 2 = 10 kmph Amsar karshe: (A). 