document.write( "Question 1202341: Rosie ran to the park at 7 miles per hour and walked back home at 3 miles per hour. How many miles was it to the park if the round trip took 20 hours? Begin by drawing a diagram of distances traveled and writing the distance equation on your paper. \n" ); document.write( "
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Rosie ran to the park at 7 miles per hour and walked back home at 3 miles per hour. How many miles was it to the park if the round trip took 20 hours? Begin by drawing a diagram of distances traveled and writing the distance equation on your paper.
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\n" ); document.write( "Avg speed of a round trip = \"2v%5B1%5D%2Av%5B2%5D%2F%28v%5B1%5D%2Bv%5B2%5D%29\"
\n" ); document.write( "= 2*7*3/(7+3) = 4.2 mi/hr
\n" ); document.write( "d = r*t = 84 mi
\n" ); document.write( "---> 42 miles each way
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