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Coordinating arrival (Posted on 2015-09-15) Difficulty: 3 of 5
Alex wants to take his two sons to visit their grandmother,
living 33 kilometers away.
His motorcycle can run 25 kilometers per hour if he rides alone, but the speed drops to 20 kph if he carries one passenger and he cannot carry two.
The walking speed of each of the boys is 5 kph.

How can the three of them reach grandmother’s house in 3 hours?

Source : Russian Mathematical Olympiad (1999)

See The Solution Submitted by Ady TZIDON    
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  Subject Author Date
SolutionSlightly different mothod to solution.Jer2015-09-15 13:20:13
SolutionsolutionCharlie2015-09-15 10:57:22
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