 
 <translate> Question: A man rows his boat 85 km downstream and 45 km upstream, taking 2 1/2 hours each time. Find the speed of the stream?
Options:
(A) 1 kmph
(B) 6 kmph
(C) 5 kmph
(D) 8 kmph
(E) 7 kmph Let's think first. Some random reasoning: <hau> Tambaya: Wani mutum yana tuka jirginsa mai nisan kilomita 85 zuwa ƙasa da kuma kilomita 45 zuwa sama, yana ɗaukar sa'o'i 2 da rabi a kowane lokaci. Gano saurin rafi? Zaɓuɓɓuka: (A) 1 kilomita a kowace awa (B) 6 km a kowace awa (C) 5 km a kowace awa (D) 8 km a kowace awa (E) 7 km/h Bari mu fara tunani. Wani tunani na bazuwar: 