Four Travelers Problem, An Advice
A good way to approach problem solving is to ask questions like
- Did I ever see anything similar?
- Do I know of a problem with similar conditions?
- What's the data?
To make asking questions even more useful one may build a glossary of terms related to the problem and then turn one's attention to each of the terms in turn. In the deBono's Thinking Course Edward deBono offers several devices to structure and improve thinking. The first one is PMI - Plus, Minus, Interesting. After composing a term glossary and asking and answering questions about each, try to classify your knowledge and, perhaps, insights, using PMI.
Just to help you out, let me start with a few terms obviously related to the problem
- Parallel lines
- Points of intersection
- Constant speed
- Uniform motion