Question 433314
To find Nancy's rate of travel, we have to solve for:
6/x-2=6/(x+2)+1/3hr.
Multiply both sides by 3(x-2)(x+2), we get:
18(x+2)=18(x-2)+x2-4
18x+36=18x-36+x2-4
0=x2-76
76=x2
√76=x
√4√19=x
2√19=x
-------------
Nancy's boat goes about 8.72 mph in still water.
*[invoke quadratic "x", 1, 0, -76 ]