document.write( "Question 1139078: Please explain:
\n" ); document.write( "A cross-country skier reaches the 10-km mark of a race 40 min after reaching the 3-km mark. Find and interpret the speed (average rate of change) of the skier in km per hr. \n" ); document.write( "

Algebra.Com's Answer #756856 by ikleyn(52786) $\"\"$ $\"About$

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document.write( "The skier covered the distance of 7 kilometers between the 3-km mark and 10-km mark in 40 minutes.\r\n" );
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document.write( "40 minutes =  of an hour.\r\n" );
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document.write( "Therefore, the average rate of the skier is the ratio\r\n" );
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document.write( "    average rate =  =  =  =  = 11.5 miles per hour.\r\n" );
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\n" ); document.write( "\n" ); document.write( "Answered, solved, completed and explained.\r
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\n" ); document.write( "\n" ); document.write( "The note of significant importance :\r
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document.write( "    The combination of words \"average rate of change\"  is not a synonym to \"average speed\" or \"average rate\". \r\n" );
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document.write( "    This combination of words \"average rate of change\" is never the term of usage, when you talk about \r\n" );
document.write( "    \"average speed\" or \"average rate of movement\".\r\n" );
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document.write( "    The only right and correct terms in this case are \"average rate\" or \"average speed\".\r\n" );
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document.write( "    Watch your language !\r\n" );
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document.write( "    If you use incorrect terms, you demonstrate that you don't know a standard terminology.\r\n" );
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