Question

If a plane can travel 490 miles per hour with the wind and 430 miles per hour against the​ wind, find the speed of the wind and the speed of the plane in still air.

Answer 1

Step-by-step explanation:

:

:

Let s = speed of plane in still air

Let w = speed of the wind

:

Two simple equations

s + w = 490

s - w = 430

--------------adding eliminates w, find s

2s = 920

s = 920/2

s = 460 mph in still air

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Answer 2

Step-by-step explanation:

speed of the plane in still air= (430+490)/2

=460

speed of the wind =(490-430)/2

=30