document.write( "Question 894922: a man walks x km uphill at 3km/h and walks the same distance back at 6km/h. What is his average speed? \n" ); document.write( "
Algebra.Com's Answer #542432 by Alan3354(69443)\"\" \"About 
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Avg speed = 2*3*6/(3+6)
\n" ); document.write( "= 4 km/hr
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