document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=659660>Question 659660</A>: <I><SPAN STYLE=\"word-break: break-all;\"> a plane can travel 1200 miles with the wind in 20 hours. on the return trip the plane can travel 2/3 the distance in the same amount of time. what is the speed of the plane and the speed of the wind?\r<BR>\n" );
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document.write( "i have already tried to solve this problem out, this is what i came up with:\r<BR>\n" );
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document.write( "(x+y)20=1200<BR>\n" );
document.write( "(x-y)20=1800 ---> (1200/ (2/3) =1800) \r<BR>\n" );
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document.write( "i then put it in the equation in the calculator as matrices:\r<BR>\n" );
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document.write( "A[20 20]  B[1200]\r<BR>\n" );
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document.write( "A[20 -20] B[1800]\r<BR>\n" );
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document.write( "i got [75]<BR>\n" );
document.write( "      [-15]\r<BR>\n" );
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document.write( "is this right? i heard from my teacher we are not supposed to have negatives but i'm not sure if i had set this equation right.. please help :( \r<BR>\n" );
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document.write( " </SPAN>\n" );
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document.write( "The return distance is 2/3*1200 = 800 not 1800.<BR>\n" );
document.write( "Then you should get <BR>\n" );
document.write( "x = 50<BR>\n" );
document.write( "y = 10 </SPAN>\n" );
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