 
 <translate> Q: A man rows his boat 90 km downstream and 45 km upstream, taking 2 1/2 hours each time. Find the speed of the stream?
Options:
(A) 9 kmph
(B) 6 kmph
(C) 5 kmph
(D) 8 kmph
(E) 7 kmph Let's give some random thoughts before answering. <ibo> Ajụjụ: Nwoke na-akwọ ụgbọ mmiri ya kilomita 90 na-agbada na kilomita 45 na-arịgo, na-ewe awa 2 1/2 oge ọ bụla. Chọta ọsọ nke iyi ahụ? Nhọrọ: (A) 9 kmph (B) 6 kmph (C) 5 kmph (D) 8 kmph (E) 7 kmph Ka anyị chee echiche tupu anyị azaa ajụjụ a. 