document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1177337>Question 1177337</A>: <I><SPAN STYLE=\"word-break: break-all;\"> When a plane flies with the​ wind, it can travel 920 miles in 2 hours. When the plane flies in the opposite​ direction, against the​ wind, it takes 4 hours to fly the same distance. Find the rate of the plane in still air and the rate of the wind. </SPAN>\n" );
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document.write( "let the rate of the plane in still air be x\r<BR>\n" );
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document.write( "and the rate of the wind be y\r<BR>\n" );
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document.write( "rate with wind =( x+y) mph\r<BR>\n" );
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document.write( "distance = 920 miles\r<BR>\n" );
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document.write( "time = 2 hours\r<BR>\n" );
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document.write( "d/r = t<BR>\n" );
document.write( "920/(x+y) =2\r<BR>\n" );
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document.write( "2x+2y =920<BR>\n" );
document.write( "/2<BR>\n" );
document.write( "x+y = 460 --------------(1)\r<BR>\n" );
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document.write( "Against wind rate = (x-y)\r<BR>\n" );
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document.write( "920/(x-y) = 4\r<BR>\n" );
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document.write( "4x-4y = 920<BR>\n" );
document.write( "/4<BR>\n" );
document.write( "x-y = 230------------------(2)\r<BR>\n" );
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document.write( "Add equation (1) & (2)\r<BR>\n" );
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document.write( "2x = 690<BR>\n" );
document.write( "x= 345 <BR>\n" );
document.write( "the rate of the plane in still air 345 mph\r<BR>\n" );
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document.write( "the rate of the wind be 115 mph \r<BR>\n" );
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document.write( " </SPAN>\n" );
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