document.write( "Question 450161: If I average 20 miles per hour on the way to a show and 30 miles per hour on the way back, what was my average speed for the entire trip?
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Algebra.Com's Answer #309721 by richard1234(7193)\"\" \"About 
You can put this solution on YOUR website!
Answer is not 25 (more time is taken going 20 mph than 30 mph).\r
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\n" ); document.write( "\n" ); document.write( "Suppose the distance from you to the show is 60 miles (we can choose such a number since the distances will all cancel out). Then, it takes 3 hours to get there and 2 hours to return back, so 5 hours total. You drove 120 miles total, so the average speed is 120 mi/5 hr = 24 mph.
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