document.write( "Question 812261: Tony flew his ultralight plane to the next town against a head wind of 10mph; the trip took 2 1/2 hours. The return trip with the same wind took 1 1/2 hours. what was the speed of tonys plane? \n" ); document.write( "
Algebra.Com's Answer #489096 by TimothyLamb(4379)\"\" \"About 
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s = d / t
\n" ); document.write( "d = s * t
\n" ); document.write( "w = 10
\n" ); document.write( "---
\n" ); document.write( "out: d = (s - w)2.5 = (s - 10)2.5 = 2.5s - 25
\n" ); document.write( "bck: d = (s + w)1.5 = (s + 10)1.5 = 1.5s + 15
\n" ); document.write( "---
\n" ); document.write( "2.5s - 25 = 1.5s + 15
\n" ); document.write( "---
\n" ); document.write( "s = 40 mph
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