SOLUTION: It took an airplane 2hours to fly 640mi against a headwind. The return trip with the wind took 1 1/3hours. Find the speed of the plane with no wind and the windspeed.

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Question 863014:
It took an airplane 2hours to fly 640mi against a headwind. The return trip with the wind took 1 1/3hours. Find the speed of the plane with no wind and the windspeed.
Answer by checkley79(3341) About Me  (Show Source):
You can put this solution on YOUR website!
D=RT
640=(R-W)*2
(R-W)=640/2=320 MPH AGAINST THE WIND.
640=(R+W)*1.33
(R+W)=640/1.33
(R+W)=481.20 MPH WITH THE WIND.
(481.20-320)/2=161.20/2=80.6 MPH IS THE WIND SPEED.
320+80.6=400.6 AVERAGE SPEED OF THE PLANE WITH NO WIND.
481.2-80.6=400.6 DITTO.