document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=250688>Question 250688</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A bird can fly 35 mph in still air, 30 mph with the wind and 5 mph against the wind.  What speed is the wind? </SPAN>\n" );
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document.write( "bird . . . .35 = r<BR>\n" );
document.write( "bird . . . 65 = r + c<BR>\n" );
document.write( "bird . . . 5 = r -c\r<BR>\n" );
document.write( "\n" );
document.write( "substitute r with 35.\r<BR>\n" );
document.write( "\n" );
document.write( "65 = 35 + c<BR>\n" );
document.write( "c = 30.<BR>\n" );
document.write( "check<BR>\n" );
document.write( "5 = 35 - 30 [check]\r<BR>\n" );
document.write( "\n" );
document.write( "the speed of the wind is 30 mph </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );