document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=30097>Question 30097</A>: <I><SPAN STYLE=\"word-break: break-all;\"> When ace airlines changed to planes that flew 100 km/h faster than its old ones, the time of its 2800 km Dallas-Seattle flight was reduced by 30 minutes. Find the speed of the new planes\r<BR>\n" );
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document.write( "Let the speed be x (orignal)<BR>\n" );
document.write( "increased speed = x+100<BR>\n" );
document.write( "30 minutes =0.5hours<BR>\n" );
document.write( "Equation:\r<BR>\n" );
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document.write( "a=0.5, b=50, c=-280000\r<BR>\n" );
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document.write( "Simplfy and you get two solutions:<BR>\n" );
document.write( "x=-800 and x=700<BR>\n" );
document.write( "Remove the negavtive<BR>\n" );
document.write( "x=700<BR>\n" );
document.write( "700+100=800\r<BR>\n" );
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document.write( "Hence, the speed of the new planes is 800km/h\r<BR>\n" );
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