document.write( "Question 1151746: After traveling for 40 minutes, Mr. Koole had to slow to 2/3 his original speed for the rest of the trip due to heavy traffic. The total trip of 84 miles took 2 hours. Find his original speed. \n" ); document.write( "
Algebra.Com's Answer #773584 by josmiceli(19441)\"\" \"About 
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Let \"+d+\" = the distance he traveled
\n" ); document.write( "for the first 40 min
\n" ); document.write( "\"+84+-+d+\" = distance he traveled for the
\n" ); document.write( "remaining time
\n" ); document.write( "Let \"+s+\" = his speed for first 40 min
\n" ); document.write( "\"+%282%2F3%29%2As+\" = his speed for remaining time
\n" ); document.write( "----------------------------------------------------
\n" ); document.write( "(1) \"+d+=+s%2A%28+40%2F60+%29+\"
\n" ); document.write( "(2) \"+84+-+d+=+%28+%282%2F3%29%2As+%29%2A%28+2+-+%282%2F3%29+%29+\"
\n" ); document.write( "----------------------------------------------------
\n" ); document.write( "(1) \"+d+=+%282%2F3%29%2As+\"
\n" ); document.write( "and
\n" ); document.write( "(2) \"+84+-+d+=+%28+4%2F3+%29%2A%28+2%2F3+%29%2As+\"
\n" ); document.write( "(2) \"+84+-+d+=+%28+8%2F9+%29%2As+\"
\n" ); document.write( "(2) \"+84+-+%28+6%2F9+%29%2As+=+%28+8%2F9+%29%2As+\"
\n" ); document.write( "(2) \"+%2814%2F9%29%2As+=+84+\"
\n" ); document.write( "(2) \"+s+=+54+\"
\n" ); document.write( "His original speed was 54 mi/hr
\n" ); document.write( "------------------------------------
\n" ); document.write( "check:
\n" ); document.write( "\"+d+=+%282%2F3%29%2As+\"
\n" ); document.write( "\"+d+=+%282%2F3%29%2A54+\"
\n" ); document.write( "\"+d+=+36+\" mi
\n" ); document.write( "and
\n" ); document.write( "(2) \"+84+-+d+=+%28+8%2F9+%29%2As+\"
\n" ); document.write( "(2) \"+84+-+d+=+48+\"
\n" ); document.write( "(2) \"+d+=+36+\" mi
\n" ); document.write( "OK
\n" ); document.write( "
\n" ); document.write( "
\n" );