document.write( "Question 152815: 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( "a. 50 mph
\n" ); document.write( "b. 53-2/7 mph
\n" ); document.write( "c. 54-3/7 mph
\n" ); document.write( "d. 58-4/7 mph
\n" ); document.write( "e. 59-2/7 mph \n" ); document.write( "
Algebra.Com's Answer #112541 by orca(409)\"\" \"About 
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Remember that the average speed for the entire trip is defined as
\n" ); document.write( "average speed=(the total distance traveled)/(the total time spent)
\n" ); document.write( "the total distance traveled is:
\n" ); document.write( "20*(1/2)+50*(3 1/2)+75*3=10+175+225=410 miles
\n" ); document.write( "The total time spent is:
\n" ); document.write( "1/2+3 1/2 + 3= 7 hours
\n" ); document.write( "So the average speed is:
\n" ); document.write( "410/7=58 4/7
\n" ); document.write( "Therefore choose option d.\r
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