document.write( "Question 798598: therese drove for 3 hours at a speed of 40 mph, then for an additional 7 hours at a speed of 60 mph. what was her average rate of speed for the trip? \n" ); document.write( "
Algebra.Com's Answer #482298 by Finavon(81)\"\" \"About 
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Distance travelled
\n" ); document.write( "3 hrs @ 40 = 120 miles
\n" ); document.write( "7 hrs @ 60 = 420 miles
\n" ); document.write( "Total 10 hrs 540 miles
\n" ); document.write( "Average speed 54 mph
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