document.write( "Question 273726: two planes leave O'hare airport in chicago at the same time. one flies directly east at 540 miles per hour. the other flies west at 720 miles per hour. how long will it take them to be 1890 apart. \n" ); document.write( "
Algebra.Com's Answer #199928 by CharlesG2(834)\"\" \"About 
You can put this solution on YOUR website!
two planes leave O'hare airport in chicago at the same time. one flies directly east at 540 miles per hour. the other flies west at 720 miles per hour. how long will it take them to be 1890 apart.\r
\n" ); document.write( "\n" ); document.write( "am hoping you are asking how long will it take them to be 1890 miles apart\r
\n" ); document.write( "\n" ); document.write( "D distance = R rate * T time\r
\n" ); document.write( "\n" ); document.write( "540T east plane
\n" ); document.write( "720T west plane\r
\n" ); document.write( "\n" ); document.write( "720T + 540T = 1890
\n" ); document.write( "1260T = 1890
\n" ); document.write( "T = 1.5 hours\r
\n" ); document.write( "\n" ); document.write( "check: 540 * 1.5 = 810
\n" ); document.write( " 720 * 1.5 = 1080
\n" ); document.write( " 810 + 1080 = 1890
\n" ); document.write( "
\n" ); document.write( "
\n" );