<PRE><B>Question 158653</B>
Josie ran 6 miles to a friend&#39;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
{{{6/6}}} + {{{6/3}}} = 3 hrs
:
The round trip dist = 12 mi
:
Av speed = dist/time; {{{12/3}}} = 4 mph is his average speed
:
:
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