document.write( "Question 618308: 2. A train travels at an average speed of 20 mph through urban areas, 50 mph
\n" ); document.write( "through suburban areas, and 75 mph through rural areas. If a trip consists of
\n" ); document.write( "traveling half an hour through urban areas, 3-1/2 hours through suburban areas,
\n" ); document.write( "and 3 hours through rural areas, what is the train’s average speed for the entire
\n" ); document.write( "trip? \n" ); document.write( "
Algebra.Com's Answer #388836 by ankor@dixie-net.com(22740)\"\" \"About 
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2. A train travels at an average speed of 20 mph through urban areas, 50 mph
\n" ); document.write( "through suburban areas, and 75 mph through rural areas.
\n" ); document.write( " If a trip consists of traveling half an hour through urban areas, 3-1/2 hours through suburban areas, and 3 hours through rural areas, what is the train’s average speed for the entire trip?
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\n" ); document.write( "Find the total travel time
\n" ); document.write( ".5 + 3.5 + 3 = 7 hrs
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\n" ); document.write( "Let a = average speed for the entire speed
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\n" ); document.write( "Write a distance equation, dist = speed * time
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\n" ); document.write( "7a = 20(.5) + 50(3.5) + 75(3)
\n" ); document.write( "7a = 10 + 175 + 225
\n" ); document.write( "7a = 410
\n" ); document.write( "a = 410/7
\n" ); document.write( "a = 58.57 mph average speed \n" ); document.write( "
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