document.write( "Question 181624: Helen took the bus on her way to school and ran the rest of the way. She ran 3 mins. longer than she rode. If it took her 15 mins. to arrive in school, how long was her bus ride?\r
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Algebra.Com's Answer #136263 by josmiceli(19441) $\"\"$ $\"About$

You can put this solution on YOUR website!
Let $\"t%5Bb%5D\"$ = time spent on bus
\n" ); document.write( "Let $\"t%5Br%5D\"$ = time spent running
\n" ); document.write( "given:
\n" ); document.write( " $\"t%5Bb%5D+%2B+t%5Br%5D+=+15\"$
\n" ); document.write( "(1) $\"t%5Br%5D+=+15+-+t%5Bb%5D\"$
\n" ); document.write( "(2) $\"t%5Br%5D+=+t%5Bb%5D+%2B+3\"$
\n" ); document.write( "Substitute $\"t%5Br%5D\"$ in (2) for $\"t%5Br%5D\"$ in (1)
\n" ); document.write( " $\"t%5Bb%5D+%2B+3+=+15+-+t%5Bb%5D\"$
\n" ); document.write( " $\"2t%5Bb%5D+=+12\"$
\n" ); document.write( " $\"t%5Bb%5D+=+6\"$
\n" ); document.write( "The bus ride was 6 min
\n" ); document.write( "check answer:
\n" ); document.write( "(1) $\"t%5Br%5D+=+15+-+t%5Bb%5D\"$
\n" ); document.write( " $\"t%5Br%5D+=+15+-+6\"$
\n" ); document.write( " $\"t%5Br%5D+=+9\"$
\n" ); document.write( "(2) $\"t%5Br%5D+=+t%5Bb%5D+%2B+3\"$
\n" ); document.write( " $\"9+=+6+%2B+3\"$
\n" ); document.write( " $\"9+=+9\"$
\n" ); document.write( "OK \n" ); document.write( "

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