SOLUTION: find the average speed of a motorcyclist if he drives from A to B with a uniform speed of 30kmph and returns back with a speed of 20kmph.

Question 739954: find the average speed of a motorcyclist if he drives from A to B with a uniform speed of 30kmph and returns back with a speed of 20kmph.
Found 2 solutions by josmiceli, Alan3354:
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
What the average is NOT is the average of the
2 speeds, which would be
km
-------------------------
The average speed is ALWAYS
( total distance ) / ( total time )
--------------------------
No distance is given, so I can assign any
distance I want, so I will say that the one-way
distance is km
----------------------
A to B

hrs
---------------
B to A

hrs
--------------
The total distance is
km
hrs

-------------------
The average speed is:

The average speed is 24 km/hr

Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
find the average speed of a motorcyclist if he drives from A to B with a uniform speed of 30kmph and returns back with a speed of 20kmph.
--------------
avg = 2*30*20/(30+20)
= 24 km/hr
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