SOLUTION: 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 f

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:
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
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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Avg = 2*4*12/(4+12) = 96/16
Avg = 6 mi/hr
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