document.write( "Question 358662: a car traveled 600 miles at 60 mph and 40mph on the return trip. What was the average speed for the whole trip \n" ); document.write( "
Algebra.Com's Answer #255995 by checkley77(12844)\"\" \"About 
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d=rt
\n" ); document.write( "d/r=t
\n" ); document.write( "300/60+300/40=t
\n" ); document.write( "5+7.5=t
\n" ); document.write( "t=12.5 hours.
\n" ); document.write( "600/12.5=48 mph. is the average for the entire trip.
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