document.write( "Question 828673: rudy drives for an hour at 80 km/h, then 40 km/h for two hours. what was his average speed?
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Algebra.Com's Answer #499443 by TimothyLamb(4379)\"\" \"About 
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\n" ); document.write( "s = d/t
\n" ); document.write( "t = d/s
\n" ); document.write( "d = s*t
\n" ); document.write( "---
\n" ); document.write( "1st leg:
\n" ); document.write( "d = 80*1 = 80 km
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\n" ); document.write( "2nd leg:
\n" ); document.write( "d = 40*2 = 80 km
\n" ); document.write( "---
\n" ); document.write( "total distance:
\n" ); document.write( "160 km
\n" ); document.write( "total time:
\n" ); document.write( "3 hr
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\n" ); document.write( "answer:
\n" ); document.write( "average speed:
\n" ); document.write( "s = 160/3
\n" ); document.write( "s = 53.3 km/hr
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\n" ); document.write( "NOTE:
\n" ); document.write( "average speed is NOT:
\n" ); document.write( "(80 km/h + 40 km/h)/2 = 60 km/h
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