Classical problem: "One person goes from A to B. Another from B to A. The first one has a 4 km/h speed and the second one has 6 km/h. Where do they meet if AB has length of 25 km". How do you transform this into more interesting problem? What is the key of this problem? What do you think? Please help me to improve the of this old .

I try to transform it into a more visual problem following the advice of Raj Shah

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