document.write( "Question 460813: a girl rides her bike up a hill at 10 miles per hour. She then rides her bike down the hill at 30 miles per hour. What is her average speed for the round trip? \n" ); document.write( "
Algebra.Com's Answer #316085 by robertb(5830)![]() ![]() You can put this solution on YOUR website! Get the harmonic mean of the two rates:\r \n" ); document.write( "\n" ); document.write( " |