document.write( "Question 906065: Chris and Gilbert drove a total of 459 miles in 11.8 hours. Chris drove the first part of the trip and averaged 35 miles per hour. Gilbert drove the remainder of the trip and averaged 55 miles per hour. For what length of the time did Chris drive? \n" ); document.write( "
Algebra.Com's Answer #549892 by richwmiller(17219)\"\" \"About 
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x+y=11.8,
\n" ); document.write( "35*x+55*y=459
\n" ); document.write( "x=11.8-y
\n" ); document.write( "35*(11.8-y)+55*y=459
\n" ); document.write( "413.0-35y+55*y=459
\n" ); document.write( "20*y=46.0
\n" ); document.write( "y=2.3
\n" ); document.write( "x=11.8-y
\n" ); document.write( "x=9.5 hr at 35 mph and y=2.3 hr at 55 mph
\n" ); document.write( "check
\n" ); document.write( "9.5+2.3=11.8
\n" ); document.write( "35*x+55*y=459
\n" ); document.write( "35*9.5+55*2.3=459
\n" ); document.write( "332.5+126.5=459
\n" ); document.write( "459.0=459
\n" ); document.write( "ok\r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "
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