 
<translate> Speed ala mmiri = d/t = 85/(2 1/2) = 34 kmph Speed elu mmiri = d/t = 45/(2 1/2) = 18 kmph Ọsọ nke iyi = (34 - 18) / 2 = 8 kmph Azịza ikpeazụ: (D). <eng> 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). 