document.write( "Question 959269: A jet plane flying with the wind flew 2200 km in 4 hours. Flying against the wind, the plane could fly only 1820 km in the same amount of time. Find:
\n" ); document.write( "a) The rate of the plane in calm air and,
\n" ); document.write( "b) The rate of the wind
\n" ); document.write( " \n" ); document.write( "
Algebra.Com's Answer #586355 by lwsshak3(11628)\"\" \"About 
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A jet plane flying with the wind flew 2200 km in 4 hours. Flying against the wind, the plane could fly only 1820 km in the same amount of time. Find:
\n" ); document.write( "a) The rate of the plane in calm air and,
\n" ); document.write( "b) The rate of the wind
\n" ); document.write( "travel time=distance/rate
\n" ); document.write( "***
\n" ); document.write( "let x= rate of the plane in calm air
\n" ); document.write( "let c= rate of the wind
\n" ); document.write( "(x+c)=rate of plane with wind
\n" ); document.write( "(x-c)=rate of plane against wind
\n" ); document.write( "..\r
\n" ); document.write( "\n" ); document.write( "4(x+c)=2200
\n" ); document.write( "4(x-c)=1820
\n" ); document.write( "..
\n" ); document.write( "4x+4c=2200
\n" ); document.write( "4x-4c=1820
\n" ); document.write( "add
\n" ); document.write( "8x=4020
\n" ); document.write( "x=502.5
\n" ); document.write( "..
\n" ); document.write( "subtract:
\n" ); document.write( "8c=380
\n" ); document.write( "c=47.5
\n" ); document.write( "rate of the plane in calm air=505.2 km/h
\n" ); document.write( "rate of the wind =47.5 km/h \n" ); document.write( "
\n" );