Probem48+Eric+G.+Mike+J



(ms sweeney): good setup for both -- mike, i disagree with your derivative (you need to multiply both sides of the equation to eliminate fractions -- the denominators don't simply go away. eric, your work is good but at some point you took the derivative of -120,000y and got -120,000y (instead of -120,000) -- so my answer is different from both of yours. Mine is 0.433 miles downriver.