Question 689652
a small airplane for 3 hours with the wind and traveled 585km.
 The return trip against the wind took 5 hours. 
Find the rate in still air
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Let's do it this way
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Write a distance equation for each way
3(r+w) = 585
5(r-w) = 585
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Simplify, divide the 1st equation by 3, divide the 2nd equation by 5, results:
r + w = 195
r - w = 117
-------------addition eliminates w, find r
2r = 312
r = 312/2
r = 156 km/h in still air
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You can confirm this, find w and check in the original equations