document.write( "Question 967014: Joe leaves on a car trip,driving a steady 45 mph. He expects the trip to take exactly 3 hours. After he has been driving for an hour, he realizes he has forgotten an appointment, and he needs to arrive a half hour earlier than planned. How many miles per hour will he need to drive for the rest of the trip to make his goal? \n" ); document.write( "

Algebra.Com's Answer #591046 by josmiceli(19441) $\"\"$ $\"About$

You can put this solution on YOUR website!
$\"+d+=+r%2At+\"$
\n" ); document.write( " $\"+d%5B1%5D+=+45%2A3+\"$
\n" ); document.write( " $\"+d%5B1%5D+=+135+\"$
\n" ); document.write( "The distance he needs to drive must
\n" ); document.write( "be 135 mi
\n" ); document.write( "--------------
\n" ); document.write( "In $\"+1+\"$ hr, he drives
\n" ); document.write( " $\"+d%5B2%5D+=+45%2A1+\"$
\n" ); document.write( " $\"+d%5B2%5D+=+45+\"$ mi
\n" ); document.write( "------------------
\n" ); document.write( "The remaining distance he has to drive is:
\n" ); document.write( " $\"+d%5B3%5D+=+d%5B1%5D+-+d%5B2%5D+\"$
\n" ); document.write( " $\"+d%5B3%5D+=+135+-+45+\"$
\n" ); document.write( " $\"+d%5B3%5D+=+90+\"$
\n" ); document.write( "-----------------
\n" ); document.write( "He planned to drive for $\"+3+-+1+=+2+\"$ more hrs
\n" ); document.write( "He wants to drive for $\"+2+-+.5+=+1.5+\"$ hrs
\n" ); document.write( " $\"+d%5B3%5D+=+r%2A1.5+\"$
\n" ); document.write( " $\"+90+=+r%2A1.5+\"$
\n" ); document.write( " $\"+r+=+90%2F1.5+\"$
\n" ); document.write( " $\"+r+=++60+\"$
\n" ); document.write( "------------
\n" ); document.write( "He will need to drive $\"+60+\"$ mi/hr to
\n" ); document.write( "arrive 1/2 hr early
\n" ); document.write( " \n" ); document.write( "

\n" );