document.write( "Question 1101746: Judy walked into the country at 5 km per hour and then rode a bus back home at 30 kilometers per hour. It was a long trip as she was gone 21 hours. How far did she walk? \n" ); document.write( "

Algebra.Com's Answer #716350 by josmiceli(19441) $\"\"$ $\"About$

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Let $\"+d++\"$ = the one-way distance she traveled in km
\n" ); document.write( "Let $\"+t+\"$ - her time in hrs spent walking
\n" ); document.write( " $\"+21+-+t+\"$ = her time in hrs spent riding on the bus
\n" ); document.write( "(1) $\"+d+=+5t+\"$
\n" ); document.write( "(2) $\"+d+=+30%2A%28+21+-+t+%29+\"$
\n" ); document.write( "-----------------------------
\n" ); document.write( " $\"+5t+=+30%2A%28+21+-+t+%29+\"$
\n" ); document.write( " $\"+5t+=+630+-+30t+\"$
\n" ); document.write( " $\"+35t+=+630+\"$
\n" ); document.write( " $\"+t+=+18+\"$
\n" ); document.write( "and
\n" ); document.write( " $\"+21+-+t+=+21+-+18+\"$
\n" ); document.write( " $\"+21+-+t+=+3+\"$
\n" ); document.write( "----------------------
\n" ); document.write( "She walked for 18 hrs and
\n" ); document.write( "rode the bus for 3 hrs
\n" ); document.write( "---------------------------
\n" ); document.write( "check:
\n" ); document.write( "(1) $\"+d+=+5t+\"$
\n" ); document.write( "(1) $\"+d+=+5%2A18+\"$
\n" ); document.write( "(1) $\"+d+=+90+\"$ km
\n" ); document.write( "and
\n" ); document.write( "(2) $\"+d+=+30%2A%28+21+-+t+%29+\"$
\n" ); document.write( "(2) $\"+d+=+630+-+30t+\"$
\n" ); document.write( "(2) $\"+d+=+630+-+30%2A18+\"$
\n" ); document.write( "(2) $\"+d+=+630+-+540+\"$
\n" ); document.write( "(2) $\"+d+=+90+\"$ km
\n" ); document.write( "OK\r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

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