document.write( "Question 1131896: A jogger runs into the country side at a rate of 10mph. He returns along the same route at 6mph. If the total trip took 1 hour, 36 minutes, how far did he jog? \n" ); document.write( "
Algebra.Com's Answer #748626 by Alan3354(69443)\"\" \"About 
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A jogger runs into the country side at a rate of 10mph. He returns along the same route at 6mph. If the total trip took 1 hour, 36 minutes, how far did he jog?
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\n" ); document.write( "The formula for round-trip speed is similar to parallel work and parallel resistance.
\n" ); document.write( "---RT Avg = 2*r1*r2/(r1+r2)
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\n" ); document.write( "Avg = 2*10*6/(10+6) = 120/16 = 7.5 mi/hr
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\n" ); document.write( "The RT distance = r*t = 7.5 mi/hr * 1.6 hours = 12 miles round trip
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\n" ); document.write( "I'm not a proponent of memorizing a lot of formulas, but this one, and parallel work, parallel resistance, etc, are useful.
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\n" ); document.write( "PS Notice that the avg RT speed does not vary with the distance. This was an important factor in the Michelson-Morley experiment that disproved the existence of the \"ether.\"
\n" ); document.write( "Ether was put on the shelf with phlogiston.\r
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