document.write( "Question 1011736: when flying with the wind a paticular airplane travels at 430km/h. when flying against the wind the airplane can only travel at 270km/h. let the airplane's speedin still airbe Y kilometers per hour and let the wind speed be X kilometers per hour \n" ); document.write( "

Algebra.Com's Answer #627486 by josmiceli(19441) $\"\"$ $\"About$

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Flying with the wind, the plane's speed is:
\n" ); document.write( " $\"+Y+%2B+X+=+430+\"$ km/hr
\n" ); document.write( "Flying against the wind, the plane's speed is:
\n" ); document.write( " $\"+Y+-+X+=+270+\"$ km/hr
\n" ); document.write( "----------------------
\n" ); document.write( "Add the equations
\n" ); document.write( " $\"+Y+%2B+X+=+430+\"$
\n" ); document.write( " $\"+Y+-+X+=+270+\"$
\n" ); document.write( "-----------------
\n" ); document.write( " $\"+2Y+=+700+\"$
\n" ); document.write( " $\"+Y+=+350+\"$
\n" ); document.write( "Plug this result back into either equation
\n" ); document.write( " $\"+Y+-+X+=+270+\"$
\n" ); document.write( " $\"+350+-+X+=+270+\"$
\n" ); document.write( " $\"+X+=+350+-+270+\"$
\n" ); document.write( " $\"+X+=+80+\"$
\n" ); document.write( "The plane's speed in still air is 350 km/hr
\n" ); document.write( "The wind speed is 80 km/hr \n" ); document.write( "

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