 
<translate> Saurin saukar da ruwa = d/t = 85/(2 1/2) = 34 kmph Saurin hawan sama = d/t = 45/(2 1/2) = 18 kmph Saurin rafin = (34 - 18) / 2 = 8 kmph Amsar karshe: (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). 