SOLUTION: if a boy rides a bicycle 10km at an average speed of 12km/hr and again travels 12km at an average speed 0f 10km/hr,find his average speed of the entire trip?

Question 709702: if a boy rides a bicycle 10km at an average speed of 12km/hr and again travels 12km at an average speed 0f 10km/hr,find his average speed of the entire trip?
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
if a boy rides a bicycle 10km at an average speed of 12km/hr and again travels 12km at an average speed 0f 10km/hr,find his average speed of the entire trip?
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t = d/r
t = 12/10 + 10/12 = 244/120 hours
t = 61/30 hrs
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r = d/t = 22/(61/30)
r = 660/61 km/hr

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