document.write( "Question 1132341: Steve Forrester drove 25 miles at a constant speed,and then he increased his speed by 15 miles per hour for the next 65 miles.If the time required to travel 90 miles was 1.5 hours,find the speed he drove during the first 25 miles. \n" ); document.write( "

Algebra.Com's Answer #749354 by josgarithmetic(39625) $\"\"$ $\"About$

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document.write( "                   SPEED       TIME       DISTANCE\r\n" );
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document.write( "FIRSTPART           r          25/r        25\r\n" );
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document.write( "SECONDPART         r+15        65/(r+15)   65\r\n" );
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document.write( "TOTAL                           1.5        90\r\n" );
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\n" ); document.write( "\n" ); document.write( " $\"25%2Fr%2B65%2F%28r%2B15%29=1.5\"$
\n" ); document.write( "Solve for r.\r
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\n" ); document.write( "\n" ); document.write( "Simplification steps should lead to $\"cross%28r%5E2-45r-150=0%29\"$ .\r
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\n" ); document.write( "(Mistake made in steps done off-site --
\n" ); document.write( "Equation should simplify to $\"r%5E2-45r-250=0\"$ ). \n" ); document.write( "

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