document.write( "Question 326912: Two cars leave City A at the same time to travel to City B. One car travels at 72km/h and the other at 78 km/h. If the slower car arrives 20 minutes after the faster car, how far apart are City A and City B? \n" ); document.write( "
Algebra.Com's Answer #234245 by Fombitz(32388)\"\" \"About 
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Rate*Time=Distance
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\n" ); document.write( "\"Ra=72\"kph
\n" ); document.write( "\"Rb=78\"kph
\n" ); document.write( "Car A,
\n" ); document.write( "Convert from minutes to hrs to be consistent with speed.
\n" ); document.write( "\"20\" minutes=\"1%2F3\" hr
\n" ); document.write( "1.\"72%2A%28t%2B1%2F3%29=D\"
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\n" ); document.write( "Car B,
\n" ); document.write( "\"78%2At=D\"
\n" ); document.write( "2.\"t=D%2F78\"
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\n" ); document.write( "Substitute eq. 2 into eq. 1,
\n" ); document.write( "\"72%28D%2F78%2B1%2F3%29=D\"
\n" ); document.write( "\"%2872%2F78%29D%2B26=D\"
\n" ); document.write( "\"D%281-12%2F13%29=26\"
\n" ); document.write( "\"D=26%2F%281%2F13%29\"
\n" ); document.write( "\"D=26%2A13\"
\n" ); document.write( "\"D=338\"km\r
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