document.write( "Question 626063: Linda hiked up a mountain trail and camped overnight at the top. The next day she returned down the same trail. Her average rate traveling uphill was kilometers per hour and her average rate downhill was kilometers per hour. If she spent a total of hours hiking, how long was the trail?
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Algebra.Com's Answer #393953 by Alan3354(69443)\"\" \"About 
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Linda hiked up a mountain trail and camped overnight at the top. The next day she returned down the same trail. Her average rate traveling uphill was kilometers per hour and her average rate downhill was kilometers per hour. If she spent a total of hours hiking, how long was the trail?
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\n" ); document.write( "Avg spd for a round-trip is
\n" ); document.write( "2*r1*r2/(r1 + r2), r1 & r2 are the speeds
\n" ); document.write( "It's similar to parallel resistors, flow problems, etc, but times 2.
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