document.write( "Question 262200: A car travels 120 miles from A to B at 30 miles per hour but returns the same distance at 40 miles per hour. What is the average speed for the round trip? \n" ); document.write( "
Algebra.Com's Answer #193143 by richwmiller(17219)\"\" \"About 
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first leg takes 4 hours and return takes 3 hours
\n" ); document.write( "240=r*7
\n" ); document.write( "240/7=r
\n" ); document.write( "34 2/7 mph average
\n" ); document.write( "not (40+30)/2=35 but is the extra work involved worth it?
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