document.write( "Question 551208: Two planes start from Chicago at the same time and fly in opposite directions, one averaging a speed of 40mi/hr greater than the other. If they are 2000 miles apart after 5hours, find their average speeds. Please thank you. \n" ); document.write( "
Algebra.Com's Answer #359535 by mananth(16946)![]() ![]() You can put this solution on YOUR website! first plane speed = x \n" ); document.write( "second plane speed = x+40\r \n" ); document.write( "\n" ); document.write( "going away from each other so add up speeds \n" ); document.write( "x+x+40 \n" ); document.write( "=2x+40\r \n" ); document.write( "\n" ); document.write( "t=5 hours \n" ); document.write( "d=2000\r \n" ); document.write( "\n" ); document.write( "5=2000/(2x+40)\r \n" ); document.write( "\n" ); document.write( "10x+200=2000 \n" ); document.write( "10x=2000-200 \n" ); document.write( "10x=1800 \n" ); document.write( "/10 \n" ); document.write( "x= 180 mph speed of first plane \n" ); document.write( "speed of second plane = 180 +4= 220 mph\r \n" ); document.write( "\n" ); document.write( "Happy New Year \n" ); document.write( "m.ananth@hotmail.ca \n" ); document.write( " |