SOLUTION: Little red riding hood rides to grandmas house at 20 mph . She goes back on the same path at 35 mph . What is the average speed ?

Question 971470: Little red riding hood rides to grandmas house at 20 mph . She goes back on the same path at 35 mph . What is the average speed ?
Found 2 solutions by josmiceli, Alan3354:
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Average speed is always:
[ total distance traveled ] / [ time to travel that distance ]
Let = one-way distance to grandma's house
----------------
Distance to house:

Distance going back:

--------------------
Ave speed:

Divide top and bottom by

Multiply top and bottom by

mi/hr
Hope this makes sense

Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
Little red riding hood rides to grandmas house at 20 mph . She goes back on the same path at 35 mph . What is the average speed ?
---------------
Avg speed = 2*20*35/(20+35)
= 1400/55 = 280/11 mi/hr
=~ 25.45 mi/hr
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