 <translate> Speed downstream = 40 + 20 = 60 kmph
Speed upstream = 40 - 20 = 20 kmph
Therefore, the answer is (E). <yor> Iyara tó wà ní ìsàlẹ̀ odò = 40 + 20 = 60 kmph Iyara ti o wa ni oke = 40 - 20 = 20 kmph Nítorí náà, ìdáhùn náà ni (E). 