document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1161270>Question 1161270</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Solve by elimination method.\r<BR>\n" );
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document.write( "An airplane travels 400 miles against the wind in 5 hours, and makes the return trip with the same wind in 2 hours. Find the rate of the wind.<BR>\n" );
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document.write( "An airplane travels 400 miles against the wind in 5 hours, and makes the return trip with the same wind in 2 hours. Find the rate of the wind.<BR>\n" );
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document.write( "a = airplane's windspeed<BR>\n" );
document.write( "w = windspeed<BR>\n" );
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document.write( "400/5 = 80 mi/hr upwind<BR>\n" );
document.write( "400/2 = 200 mi/hr downwind<BR>\n" );
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document.write( "a + w = 200<BR>\n" );
document.write( "a - w = 80<BR>\n" );
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document.write( "2a = 280<BR>\n" );
document.write( "a = 140<BR>\n" );
document.write( "w = 60<BR>\n" );
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document.write( "a = average of the 2, = (80 + 200)/2 = 140 mi/hr<BR>\n" );
document.write( "w = 200 - 140 = 60 mi/hr </SPAN>\n" );
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