document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=414660>Question 414660</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A plane traveled 756 miles to Shanghai and back. the trip was with wind. it took 9 hours. the trip back was into the air. the trip back took 18 hours. find the speed of the plane in still air and the speed of the wind. \r<BR>\n" );
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document.write( "so far..i divided 756/9 = 84 (wind) and i divided 756/18 = 42(air)<BR>\n" );
document.write( "but i don't know how to set the equation up.\r<BR>\n" );
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document.write( "if you could that would be great! :)    </SPAN>\n" );
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document.write( "speed of the plane in still air = x mph,  speed of the wind = y mph\r<BR>\n" );
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document.write( "speed the the plane with wind i.e  x + y = 756/9 = 84\r<BR>\n" );
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document.write( "speed of the plane against the wind  i.e x-y = 756/18 = 42\r<BR>\n" );
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document.write( "now, after adding these equations,..\r<BR>\n" );
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document.write( "2x = 126\r<BR>\n" );
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document.write( "=> x = 63 \r<BR>\n" );
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document.write( "y = 84-63 = 21 \r<BR>\n" );
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document.write( "so speed of plane in still air = 63 mph\r<BR>\n" );
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document.write( "speed of the wind = 21 mph\r<BR>\n" );
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document.write( " </SPAN>\n" );
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