Question 447480
450/(140+x)+2=450/(140-x)
450(140-x)+2(140+x)(140-x)=450(140+x)
63000-450x+39200-2x2=63000+450x
39200-900x-2x2=0
0=2x2+900x-39200
0=x2+450x-19600
(x+490)(x-40)=0
x=-490 or 40
Throwing out the negative answer, we get the wind speed to be 40 mph..