Question 122091
7/(180+w)=5/(180-w)
now cross multiply.
5(180+w)=7(180-w)
900+5w=1260-7w
5w+7w=1260-900
12w=360
w=360/12
w=30 answer for the speed of the wind.
proof
7/(180+30)=5/(180-30)
7/210=5/150
.033=.033