document.write( "Question 1109022: Margaret drove to a business appointment at 80 mph. Her average speed on the return trip was 70 mph. The return trip took 1/7hr longer because of heavy traffic. How far did she travel to the appointment? \n" ); document.write( "

Algebra.Com's Answer #724038 by josmiceli(19441) $\"\"$ $\"About$

You can put this solution on YOUR website!
Let $\"+d+\"$ = the one-way distance
\n" ); document.write( "Let $\"+t+\"$ = time in hrs for the trip at $\"+80+\"$ mi/hr
\n" ); document.write( "(1) $\"+d+=+80t+\"$
\n" ); document.write( "(2) $\"+d+=+70%2A%28+t+%2B+1%2F7+%29+\"$
\n" ); document.write( "----------------------------
\n" ); document.write( " $\"+80t+=+70%2A%28+t+%2B+1%2F7+%29+\"$
\n" ); document.write( " $\"+80t+=+70t+%2B+10+\"$
\n" ); document.write( " $\"+10t+=+10+\"$
\n" ); document.write( " $\"+t+=+1+\"$
\n" ); document.write( "and
\n" ); document.write( "(1) $\"+d+=+80%2A1+\"$
\n" ); document.write( "The appointment was 80 mi away
\n" ); document.write( "----------------------------------
\n" ); document.write( "check:
\n" ); document.write( "(2) $\"+d+=+70%2A%28+1+%2B+1%2F7+%29+\"$
\n" ); document.write( "(2) $\"+d+=+70%2A%28+8%2F7+%29+\"$
\n" ); document.write( "(2) $\"+d+=+80+\"$
\n" ); document.write( "OK
\n" ); document.write( " \n" ); document.write( "

\n" );