 <translate> Speed downstream = d/t = 85/(2 1/2) = 34 kmph
Speed upstream = d/t = 45/(2 1/2) = 18 kmph
The speed of the stream = (34 - 18)/2 = 8 kmph The final answer: (D). <yor> Iyara ìsàlẹ̀ odò = d/t = 85/(2 1/2) = 34 kmph Iyara ti o wa ni oke = d/t = 45/(2 1/2) = 18 kmph Ìyára tí ìsun omi ń yára sí = (34 - 18) / 2 = 8 kmph Ìdáhùn tí ó kẹ́yìn: (D). 