document.write( "Question 107193: Two airplanes leave Dallas at the same time and fly in opposite directions. One airplane travels 80 miles per hour faster then the other. After 3 hours they are 2940 miles apart. What is rhe rate of each airplane? \n" ); document.write( "
Algebra.Com's Answer #77995 by checkley75(3666)\"\" \"About 
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3*X+3(X+80)=2940
\n" ); document.write( "3X+3X+240=2940
\n" ); document.write( "6X=2940-240
\n" ); document.write( "6X=2700
\n" ); document.write( "X=2700/6
\n" ); document.write( "X=450 MPH FOR THE SLOW PLANE
\n" ); document.write( "450+80=530 MPH FOR THE FASTER PLANE.
\n" ); document.write( "PROOF
\n" ); document.write( "3*450+3*530=2940
\n" ); document.write( "1350+1590=2940
\n" ); document.write( "2940=2940
\n" ); document.write( "
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