Question 442398
60/x+9/x-5=4
60x-300+9x=4x2-20x
0=4x2-89x+300
*[invoke quadratic "x", 4, -89, 300 ]
Throwing out the 4.1 answer, we get the speed of the canoe to be 18.108 going and 13.108 on the second part of the trip.