SOLUTION: I am trying to answer this question, but cannot understand it fully. If I cycle at 4 mph uphill, and 12 mph downhill, what is the average speed?

Question 938478: I am trying to answer this question, but cannot understand it fully. If I cycle at 4 mph uphill, and 12 mph downhill, what is the average speed?

Found 2 solutions by Fombitz, Alan3354:
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Distance=Rate*Time
Assume the distance is D.

So uphill,

and downhill,

Average speed is total distance over total time.
You travel a total of
and it took in time so,

Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
I am trying to answer this question, but cannot understand it fully. If I cycle at 4 mph uphill, and 12 mph downhill, what is the average speed?
=============
Avg speed of a round trip = 2*4*12/(4+12) = 96/16
= 6 mi/hr
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