SOLUTION: Starting at home, Christopher traveled uphill to the grocery store for 30 minutes at just 4 mph. He then traveled back home along the same path downhill at a speed of 12 mph.
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Question 841942: Starting at home, Christopher traveled uphill to the grocery store for 30 minutes at just 4 mph. He then traveled back home along the same path downhill at a speed of 12 mph.
What is his average speed for the entire trip from home to the grocery store and back? Answer by Alan3354(69443) (Show Source):
You can put this solution on YOUR website! Starting at home, Christopher traveled uphill to the grocery store for 30 minutes at just 4 mph. He then traveled back home along the same path downhill at a speed of 12 mph.
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Avg speed for a round trip, or a trip of 2 equal legs is:
avg = 2*4*12/(4+12) = 96/16
= 6 mi/hr
