document.write( "Question 220650: A man traveled from A to B at 40 miles per hour and then from B to A at 60 miles per hour. What was his average speed (in miles per hour) during the entire journey? HINT: it is not 50 mph ! \n" ); document.write( "
Algebra.Com's Answer #165603 by Alan3354(69443)\"\" \"About 
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A man traveled from A to B at 40 miles per hour and then from B to A at 60 miles per hour. What was his average speed (in miles per hour) during the entire journey? HINT: it is not 50 mph !
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\n" ); document.write( "d = rt --> t = d/r (one way)
\n" ); document.write( "t1 = d/40
\n" ); document.write( "t2 = d/60
\n" ); document.write( "Assign a distance of 120 miles one way (it will work for any distance)
\n" ); document.write( "tt = 120/40 + 120/60 (total time)
\n" ); document.write( "tt = 5 hours
\n" ); document.write( "240 miles/5 hrs = 48 mph
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