document.write( "Question 1045790: Peter cycles at 4 mph uphill, and 12 mph downhill. He rides from his house at the bottom of a hill to his grandma’s house at the top of the hill, and back home. His average speed for the whole journey is: \n" ); document.write( "
Algebra.Com's Answer #661287 by Alan3354(69443)\"\" \"About 
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Peter cycles at 4 mph uphill, and 12 mph downhill. He rides from his house at the bottom of a hill to his grandma’s house at the top of the hill, and back home. His average speed for the whole journey is:
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\n" ); document.write( "Avg = 2*4*12/(4+12) = 96/16
\n" ); document.write( "Avg = 6 mi/hr
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