document.write( "Question 365086: Helped by a strong jet stream, a Los Angeles-to-Boston plane flew 10% faster than usual and made the 4400 km trip in 30 min less time than usual. At what speed does the plane usually fly?\r
\n" ); document.write( "\n" ); document.write( "I tried a chart but I don't think I set it up right. \n" ); document.write( "

Algebra.Com's Answer #260324 by ewatrrr(24785) $\"\"$ $\"About$

You can put this solution on YOUR website!


\n" );
document.write( "Hi, 
\n" );
document.write( "Let x represent the speed the plane usually flies
\n" );
document.write( "d = r*t
\n" );
document.write( "4400km = x*t
\n" );
document.write( "t = 4400/x
\n" );
document.write( "4400km = (x + .10x)(t -.5hr)
\n" );
document.write( "4400km = 1.10x(4400/x -.5hr)
\n" );
document.write( "4400km =4840-.55hr*x 
\n" );
document.write( ".55x = 440
\n" );
document.write( "x = 800km/hr \n" );
document.write( "

\n" );