document.write( "Question 723222: The Jones family drove to Disneyland at 50 m.p.h and returned on the same route at 40 m.p.h. Find the distance to Disneyland if the total driving time was 7.2 hours. \n" ); document.write( "

Algebra.Com's Answer #443079 by josmiceli(19441) $\"\"$ $\"About$

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Let $\"+d+\"$ = distance in miles to Disneyland
\n" ); document.write( "Let $\"+t+\"$ = time in hrs to get there
\n" ); document.write( " $\"+7.2+-+t+\"$ = time in hrs to get back
\n" ); document.write( "--------------
\n" ); document.write( "Equation for going:
\n" ); document.write( "(1) $\"+d+=+50t+\"$
\n" ); document.write( "Equation for coming back:
\n" ); document.write( "(2) $\"+d+=+40%2A%28+7.2+-+t+%29+\"$
\n" ); document.write( "By substitution:
\n" ); document.write( " $\"+50t+=+40%2A%28+7.2+-+t+%29+\"$
\n" ); document.write( " $\"+50t+=+288+-+40t+\"$
\n" ); document.write( " $\"+90t+=+288+\"$
\n" ); document.write( " $\"+t+=+288%2F90+\"$
\n" ); document.write( " $\"+t+=+3.2+\"$
\n" ); document.write( "-------------
\n" ); document.write( "(1) $\"+d+=+50t+\"$
\n" ); document.write( "(1) $\"+d+=+50%2A3.2+\"$
\n" ); document.write( "(1) $\"+d+=+160+\"$
\n" ); document.write( "and
\n" ); document.write( "(2) $\"+d+=+40%2A%28+7.2+-+t+%29+\"$
\n" ); document.write( "(2) $\"+d+=+40%2A%28+7.2+-+3.2+%29+\"$
\n" ); document.write( "(2) $\"+d+=+40%2A4+\"$
\n" ); document.write( "(2) $\"+d+=+160+\"$
\n" ); document.write( "The distance to Disneyland is 160 mi\r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

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