Algebra.Com's Answer #740952 by ikleyn(52781)![\"\"](\"/images/stars/stars-13.gif\")  
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document.write( "An airplane can fly 550 miles with the wind in the same amount of time it takes to fly 425 miles against the wind.
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document.write( "Find the speed of the wind, if the airplane is flying at a constant speed of 195 miles per hour  .
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document.write( "Let r be the speed of the wind.\r\n" );
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document.write( "The time equation is\r\n" );
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document.write( "To solve it, cross multiply\r\n" );
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document.write( "550*(195-r) = 425*(195+r)\r\n" );
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document.write( "Divide both sides by 25\r\n" );
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document.write( "22*(195-r) = 17*(195+r)\r\n" );
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document.write( "22*195 - 22r = 17*195 + 17r\r\n" );
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document.write( "22*195 - 17*195 = 22r + 17r\r\n" );
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document.write( "r =  = 25 miles per hour.\r\n" );
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document.write( "Answer. The speed of the wind is 25 miles per hour.\r\n" );
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document.write( "Solved.\r
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