Posted by Liz on Tuesday, October 25, 2011 at 7:32pm.
If length along river is y, and width =x,
2x+y = 92
a = xy = x(92-2x)
This is a parabola with roots 0,46.
So, maximum value is reached at x=23.
So, the pen is 23x46
sam can paddle a canoe 30km upstream in 5 hours. the return ship takes 3 hours. find the speed of canoe in still water
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