document.write( "Question 1128428: At noon a horse and buggy headed north at 10 miles per hour. Two hours later, the roadster headed south from the same location at 30 miles per hour. At what time will the horse and buggy be 80 miles from the roadster? \n" ); document.write( "

Algebra.Com's Answer #744886 by MathLover1(20850) $\"\"$ $\"About$

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\n" ); document.write( "\n" ); document.write( " $\"80=10t%2B30%28t-2%29\"$
\n" ); document.write( " $\"80=10t%2B30t-60\"$
\n" ); document.write( " $\"40t=80%2B60\"$
\n" ); document.write( " $\"40t=140\"$
\n" ); document.write( " $\"t=140%2F40\"$
\n" ); document.write( " $\"t=3.5\"$ \r
\n" ); document.write( "\n" ); document.write( "answer: $\"t=3.5h\"$ \r
\n" ); document.write( "\n" ); document.write( "PROOF:\r
\n" ); document.write( "\n" ); document.write( " $\"80=10%2A3.5%2B30%283.5-2%29\"$
\n" ); document.write( " $\"80=35%2B30%2A1.5\"$
\n" ); document.write( " $\"80=35%2B45\"$
\n" ); document.write( " $\"80=80\"$ \r
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