document.write( "Question 1173681: Fred took 7 h to drive from Cheyenne to Boothill, a total distance of 485. He drove most of the
\n" ); document.write( "way at 80 km/h, but was slowed to 30 km/h for a time by a dust storm during the trip. How many
\n" ); document.write( "hours did he spend driving through the dust storm?
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Algebra.Com's Answer #798957 by Boreal(15235)\"\" \"About 
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x hours at 80 km/h
\n" ); document.write( "7-x hours at 30 km/h
\n" ); document.write( "80x+30(7-x)=485
\n" ); document.write( "80x+210-30x=485
\n" ); document.write( "50x=275 km
\n" ); document.write( "x=5.5 hours at 80 km/h or 440 km
\n" ); document.write( "1.5 hours at at 30 km/h or 45 km\r
\n" ); document.write( "\n" ); document.write( "1.5 hours
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