document.write( "Question 1196500: A trip of 500 kilometres took five and a half hours to complete by car. During the first 30 minutes, travelling was slow because of heavy traffic, but for the rest of the journey, the car's speed was 10km/hr, less than twice the car's speed in heavy traffic. Determine the speed of the car in heavy traffic. \n" ); document.write( "
Algebra.Com's Answer #829347 by ikleyn(52776)\"\" \"About 
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document.write( "Let x be the slow speed (in heavy traffic), in kilometers per hour.\r\n" );
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document.write( "Then the faster speed was (2x-10) kilometers per hour, according to the problem.\r\n" );
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document.write( "Now write the total distance equation\r\n" );
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document.write( "    0.5x + 5*(2x-10) = 500.    (Here 0.5 represents 0.5 hour = 30 minutes).\r\n" );
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document.write( "Simplify and find x\r\n" );
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document.write( "    0.5x + 10x - 50 = 500\r\n" );
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document.write( "       10.5x         = 500 + 50 = 550\r\n" );
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document.write( "          x                    = 550/10.5 = 52.381 km/h.\r\n" );
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document.write( "ANSWER.  The average speed in slow traffic was 52.381 km/h.\r\n" );
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\n" ); document.write( "\n" ); document.write( "For simple Travel & Distance problems,  see introductory lessons \r
\n" ); document.write( "\n" ); document.write( "    - Travel and Distance problems \r
\n" ); document.write( "\n" ); document.write( "    - Travel and Distance problems for two bodies moving in opposite directions \r
\n" ); document.write( "\n" ); document.write( "    - Travel and Distance problems for two bodies moving in the same direction (catching up)\r
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\n" ); document.write( "\n" ); document.write( "They are written specially for you.\r
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\n" ); document.write( "\n" ); document.write( "You will find the solutions of many similar problems there.\r
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\n" ); document.write( "\n" ); document.write( "Read them and learn once and for all from these lessons on how to solve simple Travel and Distance problems.\r
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\n" ); document.write( "\n" ); document.write( "Become an expert in this area.\r
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