document.write( "Question 935602: A train from London to Birmingham takes 2 hours for the journey. If the average speed of the train were decreased by 5 miles per hour, the train would take 12 minutes longer.
\n" ); document.write( "Find the distance from London to Birmingham and the average speed of the train, using simultaneous equations \n" ); document.write( "

Algebra.Com's Answer #568914 by josmiceli(19441) $\"\"$ $\"About$

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$\"+d+=+r%2At+\"$
\n" ); document.write( " $\"+d+\"$ is in miles
\n" ); document.write( " $\"+r+\"$ is in mi/hr
\n" ); document.write( " $\"+t+\"$ is in hours
\n" ); document.write( "(1) $\"+d+=+r%2A2+\"$
\n" ); document.write( "(2) $\"+d+=+%28+r+-+5+%29%2A%28+2+%2B+12%2F60+%29+\"$
\n" ); document.write( "(2) $\"+d+=+%28+r+-+5+%29%2A%28+2+%2B+1%2F5+%29+\"$
\n" ); document.write( "------------------------------
\n" ); document.write( "Substitute (1) into (2)
\n" ); document.write( "(2) $\"+2r+=+%28+r+-+5+%29%2A2.2+\"$
\n" ); document.write( "(2) $\"+2r+=+2.2r+-+11+\"$
\n" ); document.write( "(2) $\"+.2r+=+11+\"$
\n" ); document.write( "(2) $\"+r+=+55+\"$
\n" ); document.write( "and
\n" ); document.write( "(1) $\"+d+=+r%2A2+\"$
\n" ); document.write( "(1) $\"+d+=55%2A2+\"$
\n" ); document.write( "(1) $\"+d+=+110+\"$
\n" ); document.write( "It is 110 mi from London to Birmingham
\n" ); document.write( "The train's average speed is 55 mi/hr\r
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