document.write( "Question 1151331: Maria drove for two hours to get to the Fort William airport. She then flew from Fort William to Green Island. During the four hour flight to Green Island, the average speed of the plane was three times the average speed that Maria traveled on the drive to the airport. If Maria traveled a total distance of 1120 km, what was the average speed o each part of her trip. \n" ); document.write( "
Algebra.Com's Answer #773069 by josmiceli(19441)\"\" \"About 
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Let \"+s+\" = her ave speed driving
\n" ); document.write( "\"+3s+\" = her ave speed flying
\n" ); document.write( "Let \"+d+\" = distance in km that she drove
\n" ); document.write( "\"+1120+-+d+\" = distance in km she flew
\n" ); document.write( "------------------------------------------------
\n" ); document.write( "Equation for driving:
\n" ); document.write( "(1) \"+d+=+s%2A2+\"
\n" ); document.write( "Equation for flying:
\n" ); document.write( "(2) \"+1120+-+d+=+3s%2A4+\"
\n" ); document.write( "------------------------------
\n" ); document.write( "Plug (1) into (2)
\n" ); document.write( "(2) \"+1120+-+2s+=+12s+\"
\n" ); document.write( "(2) \"+14s+=+1120+\"
\n" ); document.write( "(2) \"+s+=+80+\"
\n" ); document.write( "and
\n" ); document.write( "\"+3s+=+240+\"
\n" ); document.write( "----------------------
\n" ); document.write( "She drove at 80 km/hr
\n" ); document.write( "She flew at 240 km/hr
\n" ); document.write( "-----------------------------
\n" ); document.write( "check:
\n" ); document.write( "(1) \"+d+=+s%2A2+\"
\n" ); document.write( "(1) \"+d+=+80%2A2+\"
\n" ); document.write( "(1) \"+d+=+160+\"
\n" ); document.write( "and
\n" ); document.write( "(2) \"+1120+-+d+=+3s%2A4+\"
\n" ); document.write( "(2) \"+d+=+1120+-+12s+\"
\n" ); document.write( "(2) \"+d+=+1120+-+960+\"
\n" ); document.write( "(2) \"+d+=+160+\"
\n" ); document.write( "OK\r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "
\n" );