with no wind blowing a plane travels at 240 mph if a plane t

with no wind blowing, a plane travels at 240 mph. if a plane travels 810 miles with a wind in the same time it travels 630 miles against the wind, what is the speed of the wind

Solution

D=RT OR T=D/R
T=810/(240+W)
T=630/(240-W)
810/(240+W)=630/(240-W)
810(240-W)=630(240+W)
194,400-810W=151,200+630W
-810W-630W=151,200-194,400
-1,440W=-43,200
W=-43,200/-1,440
W=30 MPH. IS THE SPEED OF THE WIND.
PROOF:
810/(240+30)=630/(240-30)
810/270=630/210
3=3