document.write( "Question 1053153: A sportsman can run 510 feet down a sand dune in 30 seconds. He can run 165 feet up the sand dune in 55 seconds. How fast can the sportsman run in the sand on level ground? \n" ); document.write( "
Algebra.Com's Answer #668442 by Alan3354(69443)\"\" \"About 
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A sportsman can run 510 feet down a sand dune in 30 seconds. He can run 165 feet up the sand dune in 55 seconds. How fast can the sportsman run in the sand on level ground?
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\n" ); document.write( "No way to know.
\n" ); document.write( "There's no reason to assume running on level ground is the average of up and down the hill.
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