 <translate> Speed of the boat in still water = (60+100)/2 = 80 kmph. Speed of the stream = (100-60)/2 = 20 kmph
Therefore, the answer is (D). <yor> Iyara ọkọ oju omi ni omi ti o dakẹ = (60+100) / 2 = 80 kmph. Iyara ti iṣan = (100-60) / 2 = 20 kmph Nítorí náà, ìdáhùn náà ni (D). 