Crossing the Bridge
Try different possible starting pairs and work systematically from there.
If one person takes 10 minutes to cross the bridge, and another takes 7 minutes, how can they all cross in just 17 minutes?
If A is the quickest to cross, then B, then C, then D, can you describe each of the strategies in terms of As, Bs, Cs and Ds, and then identify the difference?
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