document.write( "Question 281742: Travel up a hill at 3 miles per hour and down the hill at 6 miles per hour on the same trail, what is the average speed traveled? Teacher says it is not 4.5 mph. \n" ); document.write( "
Algebra.Com's Answer #204695 by scott8148(6628)\"\" \"About 
You can put this solution on YOUR website!
teacher is right\r
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\n" ); document.write( "\n" ); document.write( "since the size of the hill is not a factor, let's say the hill is 6 miles long\r
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\n" ); document.write( "\n" ); document.write( "it takes 2 hours to go up (6/3), and one hour to come down (6/6)\r
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\n" ); document.write( "\n" ); document.write( "so you spend 3 hours going 12 miles ___ 12 / 3 = 4 mph
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