document.write( "Question 962530: My textbook doesn't give an example exactly like this one, so I am not sure I am doing it right....
\n" ); document.write( "Susan rode the trolley to the park at 20 mph and jogged back at 8 mph. If the round trip took 7 hours, how far is it to the park ? The answer I got was 40 miles, but I would love to be sure. Thank you so much for your help.
\n" ); document.write( " \n" ); document.write( "
Algebra.Com's Answer #588100 by stanbon(75887)\"\" \"About 
You can put this solution on YOUR website!
Susan rode the trolley to the park at 20 mph and jogged back at 8 mph. If the round trip took 7 hours, how far is it to the park ? The answer I got was 40 miles, but I would love to be sure.
\n" ); document.write( "----------------------
\n" ); document.write( "To park DATA:
\n" ); document.write( "rate = 20 mph ; distance = x miles ; time = d/r = x/20 hrs
\n" ); document.write( "------------------
\n" ); document.write( "From park DATA:
\n" ); document.write( "rate = 8 mph ; distance = x miles ; time = d/r = x/8 hrs
\n" ); document.write( "------
\n" ); document.write( "Equation:
\n" ); document.write( "time + time = 7 hrs
\n" ); document.write( "-----
\n" ); document.write( "x/20 + x/8 = 7 hrs
\n" ); document.write( "-----
\n" ); document.write( "8x + 20x = 7*20*8
\n" ); document.write( "-----
\n" ); document.write( "28x = 1200
\n" ); document.write( "x = 40 miles :: (You are correct)
\n" ); document.write( "--------------
\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
\n" ); document.write( "------------ \n" ); document.write( "
\n" );