SOLUTION: A light private plane can fly 120 mph in still air. Flying against the wind, the plane can fly 320 miles in the same time it requires to fly 640 miles with the wind. Find the rate

Question 205998: A light private plane can fly 120 mph in still air. Flying against the wind, the plane can fly 320 miles in the same time it requires to fly 640 miles with the wind. Find the rate of the wind.
Answer by checkley77(12844) (Show Source): You can put this solution on YOUR website!
D=RT OR T=D/R
T=320/(120-W)
T=640/(120+W)
320/(120-W)=640/(120+W)
640(120-W)=320(120+W)
76,800-640W=38,400+320W
-640W-320W=38,400-76,800
-980W=-38,400
W=-38,400/-960
W=40 MPH IS THE WIND SPEED.
PROOF:
320/(120-40)=640/(120+40)
320/80=640/160
4=4
RELATED QUESTIONS
A light private plane can fly 120 mph in still air. Flying against the wind, the plane... (answered by stanbon,lynnlo)

A one engine plane can fly 120 mph in still air. If it can fly 490 miles with a tailwind... (answered by ikleyn)

A small airplane can travel 210 mph in still air. The plane can fly 520 miles with the... (answered by greenestamps,mananth)

A plane can fly 36 miles with the wind, in the same amount of time that it can fly 12... (answered by askmemath)

A plane can fly 320 mph in still air. If it can fly 185 miles downwind in the same amount (answered by josmiceli)

A plane can fly 180 mph in calm air. Flying with the wind, the plane can fly 600 mi in... (answered by lwsshak3)

A plane can fly 190 mph in calm air. Flying with the wind, the plane can fly 836 mi in... (answered by ewatrrr,Theo)

A pilot can fly 2070 miles with the wind in the same time she can fly 1840 miles against... (answered by ikleyn)

A plane can fly 300 miles with the wind in the same amount of time as it can travel 210... (answered by josgarithmetic)