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)![]() ![]() You can put this solution on YOUR website! 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( "------------------- \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 \n" ); document.write( " |