SOLUTION: Starting at home, Emily traveled uphill to the grocery store for 20 minutes at just 6 mph. She then traveled back home along the same path downhill at a speed of 12 mph. What is

Question 895513: Starting at home, Emily traveled uphill to the grocery store for 20 minutes at just 6 mph. She then traveled back home along the same path downhill at a speed of 12 mph.
What is her average speed for the entire trip from home to the grocery store and back?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Average speed is always:
( total distance traveled ) / ( total time spent traveling )
Let = the one-way distance to the store
------------------------
From home to store:

mi
( note that I converted minutes to hours )
------------------------------------
Let = time in hours to get home
From store to home:

hr
------------------
Her average speed is:

mi/hr

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