document.write( "Question 452379: A plane flies 500 miles with the wind and 340 miles against the wind in the same length of time. If
\n" ); document.write( "the speed of the wind is 20 mph, what is the speed of the plane in still air?
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Algebra.Com's Answer #311115 by jorel1380(3719)\"\" \"About 
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500/s+20=340/s-20
\n" ); document.write( "340(s+20)=500(s-20)
\n" ); document.write( "340s+6800=500s-10000
\n" ); document.write( "16800=160s
\n" ); document.write( "s=105
\n" ); document.write( "The still air speed of the plane is 105 mph..
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