document.write( "Question 962822: A plane takes about 4.5 hours to fly 1800 miles from chicago to sacramento. At the same time another plane flies from chicago to sacramento. This plane travels with the same average airspeed, but the flight to chicago takes 3.75 hours. Find the average airspeed of the planes. Find the average wind speed. \n" ); document.write( "
Algebra.Com's Answer #588241 by lwsshak3(11628)\"\" \"About 
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A plane takes about 4.5 hours to fly 1800 miles from chicago to sacramento. At the same time another plane flies from sacramento to chicago. This plane travels with the same average airspeed, but the flight to chicago takes 3.75 hours. Find the average airspeed of the planes. Find the average wind speed.
\n" ); document.write( "***
\n" ); document.write( "let x=ave air speed of both planes
\n" ); document.write( "let c=ave wind speed
\n" ); document.write( "(x-c)=speed of plane, Chicago to Sacramento
\n" ); document.write( "(x+c)=speed of plane, Sacramento to Chicago
\n" ); document.write( "travel time*speed=distance
\n" ); document.write( "..
\n" ); document.write( "4.5(x-c)=1800
\n" ); document.write( "3.75(x+c)=1800
\n" ); document.write( "..
\n" ); document.write( "4.5x-4.5c=1800
\n" ); document.write( "3.75x+3.75c=1800
\n" ); document.write( "..
\n" ); document.write( "16.875x-16.875c=6750
\n" ); document.write( "16.875x+16.875c=8100
\n" ); document.write( "add
\n" ); document.write( "33.75x=14850
\n" ); document.write( "x=440
\n" ); document.write( "4.5c=4.5x-1800
\n" ); document.write( "4.5c=180
\n" ); document.write( "c=40
\n" ); document.write( "average airspeed of the planes=180 mph
\n" ); document.write( "average wind speed=40 mph\r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "
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