SOLUTION: 5. if a plane can travel 480miles/hr with windand 400 miles/hr against the wind, find the speed of the plane in still air.

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Question 314636: 5. if a plane can travel 480miles/hr with windand 400 miles/hr against the wind, find the speed of the plane in still air.
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let V be the plane speed in still air, W be wind speed.
1.V%2BW=480
2.V-W=400
Add eq.1 and eq.2,
2V=880
V=440
The speed of the plane in still air is 440 mph.