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To and fro (Posted on 2011-11-23) Difficulty: 3 of 5
Johnny left point A, walking North at a steady velocity V km/h . At the moment that he was at a distance of 6 km from A, a biker Tom left A to bring Johnny back, his speed being 9 km/h higher than Johnny's.
When they met they turned back and travelled South at 4 km/h.

For what value of V the duration of Johnny's trip would be minimal?

No Solution Yet Submitted by Ady TZIDON    
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  Subject Author Date
SolutionKenny M2011-11-25 10:54:11
SolutionsolutionCharlie2011-11-23 13:09:36
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