document.write( "Question 280061: A car traveling at a rate of 30 km/h left Gander. A second car left Gander 1 hour later. At what rate
\n" ); document.write( "must the second car travel to catch up with the first in 3 hours?
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Algebra.Com's Answer #203535 by josmiceli(19441)\"\" \"About 
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Start a stopwatch when the 2nd car leaves Gander
\n" ); document.write( "When I start the stopwatch, the 1st car has a
\n" ); document.write( "\"30%2A1+=+30\" mile head start
\n" ); document.write( "When I stop the stopwatch, they both will have
\n" ); document.write( "driven for the same time, which is \"3\" hrs
\n" ); document.write( "1st car:
\n" ); document.write( "\"d%5B1%5D+=+30%2A3\"
\n" ); document.write( "\"d%5B1%5D+=+90\" mi
\n" ); document.write( "2nd car:
\n" ); document.write( "\"d%5B2%5D+=+d%5B1%5D+%2B+30\"
\n" ); document.write( "\"d%5B2%5D+=+90+%2B+30\"
\n" ); document.write( "\"d%5B2%5D+=+120\" mi
\n" ); document.write( "and
\n" ); document.write( "\"d%5B2%5D+=+r%5B2%5D%2A3\"
\n" ); document.write( "\"120+=+r%5B2%5D%2A3\"
\n" ); document.write( "\"r%5B2%5D+=+40\"
\n" ); document.write( "The 2nd car must drive 40 mi/hr to catch the 1st car
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