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Josie ran 6 miles to a friend's house at 6 mph, but returned home along the same route at 3 mph.
What was her average speed for the whole trip?
First find the time for the round trip
Time = dist/speed
To time + Return time = Total time
= 3 hrs
The round trip dist = 12 mi
Av speed = dist/time;
= 4 mph is his average speed