document.write( "Question 109791: a semi truck travels 300 miles through flat land in the same amount of time it travels 180 miles through the mountain. the rate of the truck is 20 miles per hour slower in the mountains than in the flat land. find the flat land and mountain rates. \n" ); document.write( "
Algebra.Com's Answer #79993 by stanbon(75887)\"\" \"About 
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a semi truck travels 300 miles through flat land in the same amount of time it travels 180 miles through the mountain. the rate of the truck is 20 miles per hour slower in the mountains than in the flat land. find the flat land and mountain rates.
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\n" ); document.write( "Flatland DATA:
\n" ); document.write( "distance = 300 miles; rate = x mph ; time = d/r = 300/x hrs.
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\n" ); document.write( "Mountain DATA:
\n" ); document.write( "distance = 180; rate = x-20 mph ; time = d/r = 180/(x-20) hrs
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\n" ); document.write( "EQUATION:
\n" ); document.write( "time = time
\n" ); document.write( "300/x = 180/(x-20)
\n" ); document.write( "5/x = 3/(x-20)
\n" ); document.write( "5x-100 = 3x
\n" ); document.write( "2x = 100
\n" ); document.write( "x = 50 mph (Flatland rate)
\n" ); document.write( "x-20= 30 mph (Mountain rate)
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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