SOLUTION: John walks 15km/hr for 3 hrs and then rides a bike for 1 hour covering 9km. What is his average speed for the whole trip?

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Question 1089405: John walks 15km/hr for 3 hrs and then rides a bike for 1 hour covering 9km. What is his average speed for the whole trip?
Found 2 solutions by josgarithmetic, ikleyn:
Answer by josgarithmetic(39615) About Me  (Show Source):
Answer by ikleyn(52765) About Me  (Show Source):
You can put this solution on YOUR website!
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John walks 15km/hr for 3 hrs and then rides a bike for 1 hour covering 9km. What is his average speed for the whole trip?
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"John walks 15km/hr for 3 hrs . . . "

I do not believe in these numbers. More precisely, I do not believe in walking speed of 15 km/h.