document.write( "Question 1139188: Evan went on a bike ride of 120 miles. He realized that if he had gone 18 mph faster, he would have arrived 15 hours sooner. How fast did he actually ride?
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Algebra.Com's Answer #756965 by josmiceli(19441) $\"\"$ $\"About$

You can put this solution on YOUR website!
Let $\"+s+\"$ = the speed he actually went
\n" ); document.write( "(1) $\"+d+=+%28+s+%2B+18+%29%2A%28+t+-+15+%29+\"$
\n" ); document.write( "(2) $\"+d+=+s%2At+\"$
\n" ); document.write( "-------------------------------------
\n" ); document.write( "(2) $\"+s+=+d%2Ft+\"$
\n" ); document.write( "(1) $\"+d+=+%28+d%2Ft+%2B+18+%29%2A%28+t+-+15+%29+\"$
\n" ); document.write( "(1) $\"+120+=+%28+120%2Ft+%2B+18+%29%2A%28+t+-+15+%29+\"$
\n" ); document.write( "(1) $\"+120+=+120+%2B+18t+-+1800%2Ft+-+270+\"$
\n" ); document.write( "(1) $\"+270+=+18t+-+1800%2Ft+\"$
\n" ); document.write( "(1) $\"+270t+=+18t%5E2+-+1800+\"$
\n" ); document.write( "(1) $\"+18t%5E2+-+270t+-+1800+=+0+\"$
\n" ); document.write( "(1) $\"+t%5E2+-+15t+-+100+=+0+\"$
\n" ); document.write( "(1) $\"+%28+t+-+20+%29%2A%28+t+%2B+5+%29+=+0+\"$
\n" ); document.write( " $\"+t+=+20+\"$
\n" ); document.write( "and
\n" ); document.write( " $\"+120+=+s%2A20+\"$
\n" ); document.write( " $\"+s+=+6+\"$
\n" ); document.write( "He rode 6 mi/hr
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\n" ); document.write( "check:
\n" ); document.write( "(1) $\"+120+=+%28+120%2Ft+%2B+18+%29%2A%28+t+-+15+%29+\"$
\n" ); document.write( "(1) $\"+120+=+%28+120%2F20+%2B+18+%29%2A%28+20+-+15+%29+\"$
\n" ); document.write( "(1) $\"+120+=+%28+6+%2B+18+%29%2A5+\"$
\n" ); document.write( "(1) $\"+120+=+24%2A5+\"$
\n" ); document.write( "(1) $\"+120+=+120+\"$ \r
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