document.write( "Question 884865: A cross country skier reaches the 13-km mark of a race 40 min after reaching the 3-km mark. Find the speed (average rate of change) of the skier. \n" ); document.write( "
Algebra.Com's Answer #534720 by JulietG(1812)\"\" \"About 
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The difference between 13km and the 3km mark is 10km.
\n" ); document.write( "He travels 10km in 40 minutes.
\n" ); document.write( "That's 1 km per 4 minutes.
\n" ); document.write( "60 minutes in an hour.
\n" ); document.write( "60 * \"1%2F4\"=15kmh
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