question_answer

A boat goes 32 km upstream and 36 km downstream in 7 hours. In 9 hours, it can go 40 km upstream and 48 km downstream. If x represents the speed of the boat in still water in km/hr and y represents the speed of the stream in km/hr, then____.

A)  \[x+y=12,\text{ }x-y=8\]

B)  \[x+y=5,\text{ }x-y=11\]

C)  \[x+y=6.\text{ x-}y=10\]

D)  \[x+y=10,\text{ }x-y=6\]