document.write( "Question 855821: An airplane traveling with a 20mph tailwind covers 270 miles. On the return trip against the wind, it covers 190 miles in the same amount of time. What is the speed of the plane?\r
\n" ); document.write( "\n" ); document.write( "I set the equation like this : 270/x+20 = 190/x-20
\n" ); document.write( "I got an answer of 20 but my answer key says its 115 and I don't know how they arrived at that answer. Any help would be appreciated. \r
\n" ); document.write( "\n" ); document.write( "Thank you so much.
\n" ); document.write( "Melissa \n" ); document.write( "
Algebra.Com's Answer #515593 by richwmiller(17219)\"\" \"About 
You can put this solution on YOUR website!
Your equation yields an answer of x = 80/23=3.4783 for the plane and a time of 190/(20-80/23)=23/2 = 11.5 hours
\n" ); document.write( "I have no idea how you got 20 from your equation.
\n" ); document.write( "You have 270/x+20 = 190/x-20
\n" ); document.write( "x is the speed of the plane and 20 is the speed of the wind
\n" ); document.write( "Subtract the wind from the plane not the plane from the wind.
\n" ); document.write( "Your equation is set up wrong. It is close but not right.
\n" ); document.write( "270/(x+20) = 190/(x-20) which yields 115 for x the speed of the plane\r
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