Question 714924
speed of canoe in still water = x mph
speed of current = y mph

Upstream speed = x-y =2.5
downstream speed = x+y = 4

add both equations

2x=6.5
x= 3.25

y= 3.25 -2.5 = 0.75

 speed of canoe in still water = 3.25 mph
speed of current = 0.75 mph