Math
posted by Sarah .
an airplane travels 500 km with the wind in the same time that it takes the airplane to travel 400 km against the wind. the average speed of the plane in still air is 180 km/h. what is the average speed of the wind?
Airplane with wind:
Distance: 500km
Speed: 180+x
Time:
Airplane against wind:
Distance: 400km
Speed: 180x
Time:
I'm not sure how to do this. Can i please get help?

Math 
bobpursley
500=(va+vw)*time
400=(vavw)*time
500=(va+vw)(400)/(vavw)
500(vavw)=400(va+vw)
you are given Va=180
Can you solve it now? 
Math 
Sarah
I'm not sure what you did. What is VA and VW?

Math 
Sarah
Thank you so much
So My equation would be:
500/180+x= 400/180x
And the answer that I get is: 20km/h.
Is at correct? 
Math 
bobpursley
correct.
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