document.write( "Question 263404: If the patterns of the fines continue at the same rate of increase at what speed will the fines be the same? Given: County A rate is +15, County B rate is +10; at 60mph fine for County A is $0 and the fine for County B is $40. \n" ); document.write( "
Algebra.Com's Answer #194107 by drk(1908)\"\" \"About 
You can put this solution on YOUR website!
If I understand the question correctly, we have two equations
\n" ); document.write( "(i) \"15%28m-60%29\"
\n" ); document.write( "(ii) \"10%28m-60%29%2B40\"
\n" ); document.write( "setting them equal, we get
\n" ); document.write( "\"15%28m-60%29+=+10%28m-60%29%2B40\"
\n" ); document.write( "distribute to get
\n" ); document.write( "\"15m+-+900+=+10m+-+600+%2B+40\"
\n" ); document.write( "combine like terms to get
\n" ); document.write( "\"15m+-+900+=+10m+-+560\"
\n" ); document.write( "subtract 10m and add 900 to get
\n" ); document.write( "\"5m+=+340\"
\n" ); document.write( "divide to get
\n" ); document.write( "\"m+=+68\"
\n" ); document.write( "So, at 68 mph,
\n" ); document.write( "city A fine will be $120
\n" ); document.write( "city B fine will be $120
\n" ); document.write( "
\n" );