SOLUTION: If you bike for 60km at 30km/h and return at 20km/h, what is your average speed for the whole trip?

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Question 402077: If you bike for 60km at 30km/h and return at 20km/h, what is your average speed for the whole trip?
Found 2 solutions by robertb, amalm06:
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
Use the harmonic mean:
2%2F%281%2F30+%2B+1%2F20%29+=+24+km%2Fhr

Answer by amalm06(224) About Me  (Show Source):
You can put this solution on YOUR website!
(1/20)(60)=3

(1/30)(60)=2

Average speed=(60+60)/5=24 km/hr